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Author Topic:   opinions: Do most of your chassis's have a tranny mount or not?
sjakes
Dirt Freak

Total posts: 254
posted October 13, 2004 06:04 AM  
Hey all whats your input on Tranny mount. I seen a chassis today that did not have a tranny mount of any sort. He said never had one and never had a problem.

I guess I was nieve, I just assumed the norm was to have one? This chassis was running a midplate so I guess thats possibly where the extra stability was.

Just wondering what everyone else has had luck, or no-luck with.

This car currently was running a powerglide, but previously had a stick, both times with no tranny mount, just midplate.

Thanks
Shawn

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marshalr
Dirt Maniac

Total posts: 148
posted October 13, 2004 06:59 AM  
Even an aluminum case glide weighs quite a bit hanging off the bolts on the block. Add some torsion loads and i'm breaking into a cold sweat now.
I can see that it would be something to try in a car that you wanted to be ultra lightweight, i just wonder about the reliability aspect.
On my current car I removed the stock crossmember and built a lightweight piece. The first race night i was having trouble getting full throttle,thinking i had just missed the adjustment i readjusted it to get full throttle. That week in the shop i checked it, found it to be short again. Found the tranny mount was sagging, thus changing the distance. I braced the tranny mount a little better, the next race was ok. I pulled the tranny mount to clean up some of my rushed fabrication, and found it had broken in two places, thus i gotta believe there is some stress there.
If a motor plate is used between the engine and tranny that may help keep everything in place.

eborcim
Dirt Freak

Total posts: 303
posted October 13, 2004 07:52 AM  
First, I had a manual with a floating rear mount/crossmember. Currently have a powerglide that hangs on the motor. Both times used rear motor mounts. May use a midplate this year on the new car. I can see the advantage of trans braces from the tailshaft housing to the block if you have room.

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted October 13, 2004 07:58 AM  
I run solid motor mounts with a mid plate. The trans is a stock 3 speed with a scatter proof bell housing. Absolutely no issues with the trans "hanging" off the block with no crossmember.

What a solid trans mount will do is crack an automatic case. I learned that the hard way.

crew42tx
Dirt Full Roller

Total posts: 53
posted October 13, 2004 08:45 AM  
We run solid front motor mounts and rear motor mounts also and have not ran a crossmember in our cars for about 6 or 7 years with no problems with a scattersheild and with castiron saginaws and with aluminum muncies. And our transmissions get in a bind becouse we have broken input and output shafts but never a housing or even an ear off of one. We can change transmissions at the track on the ground in about 10 or 15 minutes. Takes longer to get the car up in the air than to do the change out.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted October 13, 2004 11:16 AM  
mods dont run them 99% of the time, if you hit the wall and its all solid then you can break the tranny very very easily.

sjakes
Dirt Freak

Total posts: 254
posted October 13, 2004 11:49 AM  
quote:
Originally posted by zeroracing:
mods dont run them 99% of the time, if you hit the wall and its all solid then you can break the tranny very very easily.

From what I have had in the past is solid motor mounts but rubber/stock tranny mount, so in theory it could flex some if it needed to.

allzway
Dirt Maniac

Total posts: 136
posted October 13, 2004 12:18 PM  
I run solid front and rear motor mounts and do not run a tranny mount.

I would say around here it is pretty close to 50/50 in stock cars with or without the mount. Those that do run a tranny mount use rubber or poly mounts...not solid.

In modifieds it would be almost 100% without.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted October 13, 2004 12:56 PM  
every once in a while on will come acros a mod with a tranny mount.
i think it was njantz built a neat tranny mount for his mod, it went under the trann rearmount. then went up at about a 40 deg angle to above the bellhousing and mount to the midplate around that area. it looks like a sling from the side, but takes alot of the load off the bellhousing and front of tranny.

allzway
Dirt Maniac

Total posts: 136
posted October 13, 2004 01:37 PM  
quote:
Originally posted by zeroracing:
every once in a while on will come acros a mod with a tranny mount.
i think it was njantz built a neat tranny mount for his mod, it went under the trann rearmount. then went up at about a 40 deg angle to above the bellhousing and mount to the midplate around that area. it looks like a sling from the side, but takes alot of the load off the bellhousing and front of tranny.

I know of a couple of stock cars that built a brace similiar.


redneck racing
Dirt Forum Champ
Total posts: 860
posted October 13, 2004 05:03 PM  
I run solid motor mounts in my car with a stock tranny mount, read on here sometime ago that the mounts should not all be solid(maybe it was one of Sleepy's articles) and have not have had a bit of problems yet. Eddie

ryan
Dirt Forum Champ
Total posts: 776
posted October 13, 2004 05:12 PM  
I run a small cross member off of my x-brace and it is around 5lbs. I run solid motor mounts with a stock tranny mount and no midplate. Last time I got into the wall hard it just broke the rubber mount. Works for me......knock on wood. lol

[This message has been edited by ryan (edited October 13, 2004).]

Istock66
unregistered Total posts: 776
posted October 13, 2004 05:19 PM           send a private message to ryan   Edit/Delete Message   Reply w/QuoteBBBBBB
Saginaw that hangs on a scattershield, never broke one ever. just use side motor mounts front and back.

been hanging them since 1998.

Okie11m
Dirt Freak

Total posts: 287
posted October 13, 2004 08:42 PM  
Front & mid mounts , no tranny mount, saginaw & no probs. Hit the wall this year hard enuff to break a front spindle & the spool in the rear. The tranny is still "hangin" in there!!

o5racer
Dirt Freak

Total posts: 402
posted October 14, 2004 09:28 PM  

 
Heres mine. Weighs very little and does its job. Solid motor mounts and ruber trans mount.

devilsbowlss00
Dirt Newbie

Total posts: 4
posted October 15, 2004 07:20 PM  
used to crack cases with trans mount. now i run solid mounts on engine front and rear and hang powerglide has worked 1 and 1/2 years no cracks

    

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