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Author Topic:   transmission mount?????
Racer98
Member
posted May 04, 2003 08:18 PM
I have a saginaw 3 speed, and I had it mounted tight to a cross member, and it had a stock rubber mount. my tranny case crack off in all the 4 spots where it mounts to the bellhousing, was told I can mount it tight, wondering what others do?


racer17j
Member
posted May 04, 2003 08:56 PM
very simple rule if you run solid motor mounts run rubber tranny mount or vise versa something has to give and that cast housing is alot weaker than solid steel mounts


eborcim
Member
posted May 05, 2003 11:06 AM
I have stock rubber motor mounts, should I get solid motor mounts?


racer17j
Member
posted May 05, 2003 07:55 PM
all rubber will be fine all steel will not work tho


outlawstock17
Member
posted May 05, 2003 08:54 PM
wrong. all steel motor mounts and a solid transmission mount will work. i use the IMCA type motor mounts with the transmission mount a pivoting mount with one bolt. i've been running this type of mount for 3 seasons with over 500 HP and the same transmission with no failures. email me if you want a picture of the transmission mount.

outlawstock17@cox.net

stockcar5
Member
posted May 05, 2003 09:46 PM
i agree with outlaw. i run a stockcar with solid steel motor mounts and tranny mounts...never a problem. i had a guy build me a tranny mount from aluminum this year and thats working well also. if your driveline is aligned properly you wont have any trouble.

luke

towmandan
Member
posted May 05, 2003 10:02 PM
You must have alignment problems or bad vibration Ive run solid mounts on both ends from bombers to limited lates with no problems, with broken parts of that nature....I suggest you look somewhere else....towman


dman60
Member
posted May 06, 2003 12:47 PM
What about no tranny support?
Thanks,
Dman


cmiller51
Member
posted May 06, 2003 01:04 PM
I run solid engine mounts (side and rear) and no cross member. Haven't had a transmission failure yet.


outlawstock17
Member
posted May 06, 2003 01:28 PM
racer98, a friend had a similiar problem as yours......broken transmission case one week, broken main cap in the 3rd member the next week. after looking his car over closely, i noticed he had the engine/transmission angled down too far. this creates a condition called "the broken driveshaft syndrome". your driveshaft must angle down from your transmission. if it doesn't, you need to raise the tail of your transmission until it angles down a couple of degrees.

hope this helps.

Racer98
Member
posted May 06, 2003 02:10 PM
this is a imca hobbystock, rules say we have to have stock mounts, which are rubber inside, but I have heard that v6 mounts are solid. also If I run to crossmember tranny will be to low. I have a 3 speed saginaw and a ford 9 inch rearend, I think I need to get a drive shaft shortened because stock one I think will be to long, has anyone used a stock gm driveshaft? I know rearend yoke will have effect on that length. any other help anyone can give me , thanks


racer17j
Member
posted May 06, 2003 04:42 PM
drive shaft out of a nova will fit just have to get the right u joint for the rearend


stormy
Member
posted May 06, 2003 08:20 PM
if ya have to run stock motor mounts how about chaining the engine down solid? when i bought my car it had the rubber motor mounts. i didnt feel like jacking up the engine and changing em over so i welded 2 bolts, thread up, to the top of my frame, found some empty bolt holes on the front of the heads and chained it down solid- a quick fix until i pull the engine.


racer17j
Member
posted May 06, 2003 09:24 PM
imca frowns on anything that isn't stock only thing you cabn put a chain on is driveshaft and bumpers


powerglides
Member
posted May 07, 2003 06:42 AM
im running 650 gears, so im running some rpms, so i shouldnt use stock driveshaft? if not where do i get one that wont cost an arm and a leg?


RC Racing
Member
posted May 07, 2003 02:25 PM
Racer98, I would NOT use the stock drive shaft. I had one break at the green flag of the last heat race of the year while I'm on the pole.

Result: broken driveshaft, broken 9" pinion, tranny case split in half, and (worse of ALL!!!) ended season 5 pts out of 6th place.

I went to a reputable drive shaft company, told them what happened and showed them my broken driveshaft. They told me I was lucky, with the HP and the RPMs I was running, that it hadn't already happened. They said a stock shaft will flex BIG time in the middle when subject to the high revs, etc.

$175 (balanced, thicker wall, greaseless u- joints, etc) later, I've got a heavy duty drive shaft that perfomed flawlessly.

So unless others can offer you better suggestions for a substitute driveshaft, spend your money now, or spend it later.

I personally prefer to spend it now so I don't have to worry about a DNF and possibly bigger dollars expended on fixing stuff.

Take care

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


outlawstock17
Member
posted May 07, 2003 02:34 PM
wow, i've used stock driveshafts from the beginning and(knock on wood) have never had a failure. i don't run "chump" engines either. practically all driveshaft failures are a result of another problem. the "other problem" rears it ugly head as a broken driveshaft...