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Author Topic:   powerglide problems
HOTWIRE
Dirt Roller

Total posts: 18
posted April 07, 2001 01:19 AM
does anyone run the TCI valve body where you use a clutch pedal?I have burned up two powerglides in as many weeks with it and I cant figure out whats wrong. The car tries to lurch forward when you go up on the revs even with the tranny in park or neutral and the clutch can be in or out. Does anyone know what Might be the problem?

jammin
Dirt Administrator

Total posts: 3279
posted April 07, 2001 08:51 AM UIN: 16262997
I have one tranny like this....we havent had any problems like you have described....is the detent hooked up correctly inside? Did you guys build it?

HOTWIRE
Dirt Roller

Total posts: 18
posted April 07, 2001 09:28 AM
I built it . The detent seems to be done correctly. How did you do yours . I drilled a hole in the detent lever shaft and put a bolt through it to actuate the plunger. did you use the kit from tci to do this part? When your car is in P or N and you rev it.... does it try to lurch forward? MIne does... not a lot just a little. two weekendsd in a row the tranny does ok through hot laps and the heats and then has burned up before the feature during parade laps before the feature. Its like the fluid is still bypassing a little and will not let the clutch disks mesh fully. i would really appreciate it if you could help me figure this out. Its my rookie season and it is getting real frustrating taking trannies out and thinking everything is cool and then not getting to run the feature. thanks.

jammin
Dirt Administrator

Total posts: 3279
posted April 07, 2001 09:58 AM UIN: 16262997
well...you may want to look at the detent.....it sounds like it isnt opening or closing all the way....what we did on ours was took the pedal out.....put a softer spring on the detent and then actuated it by hand...this way, you know when it is in and out.....also..you might want to look at your band tightness....sounds like your low gear band could be a little tight also.. Did you burn the high gear clutches or the low gear band?

HOTWIRE
Dirt Roller

Total posts: 18
posted April 07, 2001 10:20 AM
the detent is the plunger in the valve body that the clutch linkage actuates right?the low gear went first then the high gear immediatley after.the detent only moves about 3/4 inch in the valve body. Is that similiar to yours?

jammin
Dirt Administrator

Total posts: 3279
posted April 07, 2001 10:24 AM UIN: 16262997
Yes.....there was a special linkage that you were supposed to install to get it to work correctly...did you get that in there?


jammin

KK17
Dirt Full Roller

Total posts: 75
posted April 07, 2001 12:53 PM
My bushore lurches when in p or n..... no problems with it burning up....Maybe you need to check line pressure with it in gear to see if the clutches are burning up.

HOTWIRE
Dirt Roller

Total posts: 18
posted April 07, 2001 07:21 PM
jammin, the special linkage you speak of ....is it the piece that slipped through the shifter arm . The pieces i GOT were a hollowed out shiftwer linkage and a small linkage that acuates the plunger.that all got put in. I think i might know what i messed up in the second one . I left the mod ulator plug off. would this ***** it up. I guess the problem is that I have no clue as to how an automatic tranny works and dont understand what I am trying to accomplish. I know it might take a long post but if you understand it would you mind giving me the basic lowdown on auto trannies?

jammin
Dirt Administrator

Total posts: 3279
posted April 07, 2001 08:20 PM UIN: 16262997
Well...basically.If I were u, I would get someone locally where you live that builds trannies to go thru it with you once or twice. But the lowdown on the valvebody on the TCI unit is that the valvebody they sell is a unit that basically dumps the transmission's mainline pressure thru the detent plunger. This allows the freewheeling of the rear clutches and low band for first and reverse. Now...if you will go over to the other post on the powerglides...you will see more info on how to do it without this valvebody. Stock valvebody and stuff will work if you do it right, just have to do some minor modifications to the tranny. I hope this helps...as far as the parts and what they do....its really hard to explain it in writing....some of the parts are the same size and stuff...but I would seek a person locally in the tranny shop to help. I know this didnt help you much, but I think it is your best option.

jammin

dirttrackracer
Dirt Full Roller

Total posts: 26
posted April 08, 2001 08:58 AM
I have been told that when you are idling the motor,you should always have the ball valve in closed position,but for two years I idled(breaking cams in,engine warm-up)with valve open.What is correct and why?

jammin
Dirt Administrator

Total posts: 3279
posted April 08, 2001 10:53 AM UIN: 16262997
dirt....your talking about a bushore type tranny. The TCI setup doesnt run a valve...everthing is done internally through the valvebody......even though, they are all basically doing the same thing, which is controlling the mainline pressure dump of reverse and low....thats the task to accomplish no matter how you do it.

bbracer17
Dirt Maniac

Total posts: 168
posted April 08, 2001 09:34 PM
Are you guys breaking cases also? I've spent lots of time making sure my driveshat was correct. I made extra long dowels and studed my block so I could make sure it was mounted well. Ive ran 2 racers and broke 2 glides. My old cast iron Saginaw is looking real good right now.

HOTWIRE
Dirt Roller

Total posts: 18
posted April 08, 2001 10:22 PM
have had no problem with breakage. sounds like your driveshaft too long. you been breaking the tailshaft or the bellhousing. if you use a motor plate then let the tranny tailhousing float . you need to let it move. if you dont use a motor plate then LOOSLEY mount the tailshaft to a rubber type tranny mount. If driveshaft is too long it will definatley break the tails off.

Mod 78
Dirt Roller

Total posts: 15
posted April 09, 2001 10:02 AM
Went through 2 power glides weekend before last put a 3 speed in from speedway motors no problems
quote:
Originally posted by HOTWIRE:
does anyone run the TCI valve body where you use a clutch pedal?I have burned up two powerglides in as many weeks with it and I cant figure out whats wrong. The car tries to lurch forward when you go up on the revs even with the tranny in park or neutral and the clutch can be in or out. Does anyone know what Might be the problem?

fanofdirt
Dirt Roller

Total posts: 10
posted April 09, 2001 01:22 PM
If the trans is allowed to "hang" on the back of the block it will take all of the abuse. It is best to "cradle" the back of the trans by running two rods from your midplate to a piece of tubing bolted to the crossmember mount, and thread the rods on each end and then snug them up. This will allow the rear of the trans move with the front. What happens is the rear of the case will flex and then it breaks. Know of several guys that run this and it stopped there problem.

HOTWIRE
Dirt Roller

Total posts: 18
posted April 09, 2001 07:05 PM
fan of dirt, thats a good idea. If i ever get my tranny situation under control, I will do that to my car.

HOTWIRE
Dirt Roller

Total posts: 18
posted April 09, 2001 07:10 PM
quote:
Originally posted by Mod 78:
Went through 2 power glides weekend before last put a 3 speed in from speedway motors no problems

how much does a 3 speed setup run you. what kind of clutch setup o you run. it would seem that a clutch setup would be more bulletproof than a powerglide. whats everyone else think?

bbracer17
Dirt Maniac

Total posts: 168
posted April 09, 2001 07:41 PM
I'm not using a rear mount and I have about 2 inches of yoke showing on my driveshaft. I'm not breaking tailshafts, one week the bell housing broke and the next it broke the case about 3 inches from where the tail shaft bolts. I'm going to run my three speed a couple races then I'll try it again.

ufb
Dirt Roller

Total posts: 24
posted April 09, 2001 09:31 PM
we use to run pgs .if you are braking the cases you need to run a rear trans mount.if you donnt you will brake cases.the same for alum 4 sp trans. the cast cases are stongher them the others so you donnt need a mount on that 3 sp. when i made my mount i used a stock rubber mount bolted to a 1x1 tube ,make the 1x1 tube so you can bolt it to the chassis make changing trans easer. IT IS TO BAD I M C A DONNT LET YOU RUN BERTS THAY COST LESS AND DONNT BRAKE!!!!

HOTWIRE
Dirt Roller

Total posts: 18
posted April 09, 2001 09:36 PM
SO HOW MUCH WOULD A GOOD CLUTCH AND STANDARD TRANNY RUN ME? IMCA MODIFIED MIDDLE OF THE RANGE EQUIPMENT?

ufb
Dirt Roller

Total posts: 24
posted April 10, 2001 08:51 AM
A QUARTER MASTER CLUTCH PRO 3 DISC $831.50 ,HOWE THROWOUT BEARING 102.50, MELEOD STEEL BELL 199.95 AND DO YOU HAVE A CLUTCH PEDAL ASY IN THE CAR?TRANS DONNT KNOW ABOUT PRICE. ALL THESE PRICES ARE FROM LEFTHANDER CHASSIS IN IL. WHY CANNT I M C A SEE THAT THERE RULES COST MORE THEN A BERT? ADDING THAT UPTO 1133.95 NO TRANS OR PEDLE ASY. THAT IS WHY I DONNT RUN I M C A !!!!

Mod 78
Dirt Roller

Total posts: 15
posted April 10, 2001 08:57 AM
The 3 speed from Speedway was 469 it has 1st gear taken out of it and reversed lightend then how ever much you want to spend on a clutch plus you need a blow proof bellhousing you are going to spend 1200.00 to 1500.00 if you buy everything new.
quote:
Originally posted by HOTWIRE:
SO HOW MUCH WOULD A GOOD CLUTCH AND STANDARD TRANNY RUN ME? IMCA MODIFIED MIDDLE OF THE RANGE EQUIPMENT?

KK17
Dirt Full Roller

Total posts: 75
posted April 10, 2001 06:23 PM
I ran a Saginaw from Speedway for two years and was not impressed. With 1st removed, 2nd gear is little tall for idling around the track, and for starts, etc.(depending on rear end ratio, I ran 567-600's) Your best bet is probably a standard saginaw or if you have the ching, an aluminum muncie. I switched to a PG and love it.

just my 2 cents

HOTWIRE
Dirt Roller

Total posts: 18
posted April 11, 2001 10:03 PM
I found a bushore with the external bypass for 300 bucks. i am going to run this but still want to figure out the tci valve body. I called tci and they think that I have a problem with the pump not putting out enough pressure. I will find someone with a tranny dyno and get it checked out. thanks for all the help.

dirtracer14
Dirt Maniac

Total posts: 128
posted April 11, 2001 11:06 PM UIN: 23443678
Anyone ever check the weight of one of those speedway light weight 3 speeds? For the $$$ not sure if it would be worth it!You can pick up stock one all day long for under $100.

KK17
Dirt Full Roller

Total posts: 75
posted April 12, 2001 06:20 PM
They weigh 75 lbs without bellhousing,slave, clutch. My bushore weighs 94lbs. I saved about 10lbs roughly. I ran an odd ball muncie for a season that was about 18 inches long and only weighed about 45lbs. It came in mid-sixties chevy trucks. It was a 3 speed also. You can buy them from M-west racing equip. in Chisholm Mn. phone is 218-254-2888

RWP34
Dirt Newbie

Total posts: 1
posted April 13, 2001 01:00 AM
Neat forum! I've built many glides in the last 3yrs.I got my info from a major converter rebuilder and it works great.
Low- 1/8" hole in servo supply tube.
Rev. - 3 .087" holes in the 3 dimples on
reverse piston.
Adjust band to suit. (3 3/4- 4 turns)
There are other methods too,But this works
fine. Note:trans must be disassembled
to drill rev. piston.
Basic trans skills help.

------------------

BILLY BOB
Dirt Forum Racer

Total posts: 81
posted April 26, 2001 10:51 AM
quote:
Originally posted by KK17:
They weigh 75 lbs without bellhousing,slave, clutch. My bushore weighs 94lbs. I saved about 10lbs roughly. I ran an odd ball muncie for a season that was about 18 inches long and only weighed about 45lbs. It came in mid-sixties chevy trucks. It was a 3 speed also. You can buy them from M-west racing equip. in Chisholm Mn. phone is 218-254-2888

Is the trans your taking about the one that has the real short tail housing. If so how did it hold up. I was talking to my transmission guy and he said those older trans didn't have the sincros to hold up to the on and off the gas type racing we do.
I see those old trans all day long for 20-30 bucks apiece.

Racer4
Dirt Forum Racer

Total posts: 93
posted June 08, 2001 09:46 AM
Hey guy's just for those of us who would like to do it ourselves and not buy a complete PG outright, JEGS is selling the TCI valve body that works off the detent for under 200 bucks. Just letting everybody know.

MOD RACER#93
Dirt Freak

Total posts: 251
posted June 09, 2001 11:03 PM
if your rules allow.. switch to a brinn.. they dont cost anymore than a good clutch setup for a 3 speed.. i switched middle of last year.. and havent even thought about transmissions since. just change the clutch oil every week. but if you cant.. i would just go saginaw 3spd. with a ram coupler. dont use the coupler unless you absolutly have too. there may be a little more rotating weight there.. but when the automatics blow. and your still going that's when it will pay off... just my thoughts...

Racer14K
Dirt Roller

Total posts: 12
posted June 21, 2001 07:17 PM
I have been running the powerglides since 94 and have had only two problems, both human error, not the trannies problem.
Some things you need to check.

1.The spring going from lower bellhousing flange to the detent lever should have 1/16" gap between coils, 1/8" at most. Too much you will over stretch the spring, too little it will not pull the detent lever back too full close.

2.Mounting slave cylinder to detent lever, you must have 1" of travel at detent lever when clutch pedal is depressed. When putting in the clevis pin or bolt you should have slight pressure against the detent lever but not enough too open it. If there is too much pressure against the lever it will open the dump valve slightly and do the same thing as slipping a clutch, which will burn up the clutch pack. ( To me this sounds like your problem but you need to check it out ).

3.Do you run a cooler, if not, PUT ONE ON!! They say the torque convertor generates all the heat, on the oval track trannies without a convertor they will still generate heat. USE A COOLER. The cooler it is, the longer it will last.

4.Highly recommend synthetic fluid.

5.With the pan off there is a metel tube inside the tranny to the right side, this tube can crack and lose fluid pressure.
( If you do not have full pressure on the clutch pack for an extended amount of time you can burn up the clutches ).

The lurching forward is normal on a tranny with a direct drive coupler, no problem there.

Hope this helps you, GOOD LUCK

racermay
Dirt Roller

Total posts: 9
posted June 21, 2001 11:29 PM
This may not be your problem, but with a TCI if you dump the clutch in reverse, it will burn the tranny everytime. Just be careful when you are backing up. The line pressure is so low in reverse that if you dump the clutch, the forward clutches burn up. Just a suggestion. Maybe it will help.

fanofdirt
Dirt Roller

Total posts: 10
posted June 22, 2001 10:18 AM
Actually the pressure in reverse with that valve body is 140-170 psi. To make reverse softer use the stock wave plate and only install 2 frictions. The forward clutches and band won't burn up if reverse does because they are completely different clutch packs.

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