200R4 Conversion - Tranny Mount
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Registered User
Joined: Jan 2011
Posts: 277
From: Paris, Ontario, Canada
200R4 Conversion - Tranny Mount
I have converted my 75 cutlass 350 from a Th350 to a 200R4 tranny.
I am in the process of checking the drive line operating angles because of some vibration I have over 70 mph,
With a used double hump cross member installed in the TH400 location, what is the proper transmission mount to be used?
Currently I have a universal mount from the transmission rebuilder who beefed up the tranny.
Changing so many things, I not sure where I should be height wise. Only thing I can go by is the operating angles. I don't want shim if I have the wrong mount in.
Does the 200R4 & output shaft sit at the same height as the TH350 ?
Does the dual hump crossmember mount location sit at the same height as the single hump crossmember?
Currently my engine is tilting down at 3.5 deg.
New motor mounts installed from Supercars #48-006
Jeff
I am in the process of checking the drive line operating angles because of some vibration I have over 70 mph,
With a used double hump cross member installed in the TH400 location, what is the proper transmission mount to be used?
Currently I have a universal mount from the transmission rebuilder who beefed up the tranny.
Changing so many things, I not sure where I should be height wise. Only thing I can go by is the operating angles. I don't want shim if I have the wrong mount in.
Does the 200R4 & output shaft sit at the same height as the TH350 ?
Does the dual hump crossmember mount location sit at the same height as the single hump crossmember?
Currently my engine is tilting down at 3.5 deg.
New motor mounts installed from Supercars #48-006
Jeff
Last edited by Tuffnut; Dec 21, 2018 at 05:53 AM.
Registered User
Joined: Aug 2010
Posts: 380
From: S.E. Massachusetts
For what it's worth, I swapped a 700R4 in place of the TH350 in my 80' Cutlass Supreme with an Olds 350. I replaced the trans mount with a stock TH350 mount. Never gave any problems. I used stock engine mounts just in case that matters.
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Joined: Jan 2010
Posts: 6,099
From: central Indiana
I would think the output shaft and trans mount would be in the same location on either setup. If the angles are within specs, turn the driveshaft 180* on the rearend flange. You could also try to reclock the converter on the flex plate. There are 3 possible mounting locations, sometimes rotating the converter can help. Even if everything is in balance, the tolerances can stack up between the converter,flywheel, driveshaft, rearend, Tire’s, etc and cause a vibration
Thread Starter
Registered User
Joined: Jan 2011
Posts: 277
From: Paris, Ontario, Canada
Thanks for the input guys, I was going to mark the driveshaft before I remove it and offset 180 at the rear end. Also will do the flex plate as well. Easy to do once you are under the car.
I'm going to replace the front u-joints again and change the yoke with a spare I have. Check the angles and go from there. I was worried the heights may be slightly different between crossmembers and tranny's.
Thanks
I'm going to replace the front u-joints again and change the yoke with a spare I have. Check the angles and go from there. I was worried the heights may be slightly different between crossmembers and tranny's.
Thanks
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