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So i swapped from auto to manual years ago and I had bought the correct mount (rectangular one) and when I put it in and drove it the shifter just bounced up and down, so I took the trans mount from the doner car to try it (roundish one). And it seemed to work great and never had an issue...
Well fast forward to now I got the car all apart and the rubber trans mount I had on it just looks like it needs replacing (cracked rubber) so i was looking and it seems the style i have been using is for the 6cyl cars? Can someone elaborate? Also is the v6 and v8 trans crossmember the same? I did a search but couldnt find anything...it seems like I have the v6 crossmember too? This is the one i have This is the style that seems to come up for v8 cars
The mount on the bottom is the one you should get. It has bolt holes instead of a stud like the factory piece. Make sure you leave off the spacer supplied with the new mount as it may cause driveline vibration. I put an Energy suspension poly trans mount in my car back in 2003......it's still in there today.
I wonder what the height difference if any between the two...I had been battling the infamous 70mph+ horrible vibration for quite some time...new driveshaft seemed to fix it but I was always skeptical
What I did was measure the height difference between the new mount and the old one. The poly mount is usually taller. In order to compensate for the height difference, the trans crossmember needs to be shimmed downwards. You could use steel or aluminum flat stock(I've seen guys use big washers). My car had had a pretty decent vibration and needed 3/16" spacers. They've been in there since 2003.
What I did was measure the height difference between the new mount and the old one. The poly mount is usually taller. In order to compensate for the height difference, the trans crossmember needs to be shimmed downwards. You could use steel or aluminum flat stock(I've seen guys use big washers). My car had had a pretty decent vibration and needed 3/16" spacers. They've been in there since 2003.
So you didnt measure the driveline angles? Just compensated for the difference in the mounts height? I am installing adjustable tunnel mounted torque arm, adjustable panhard and LCA (all umi rotojoints) and new shocks and springs so I bought an angle finder to help out...never set up any of this stuff but I dont see it being difficult.... I got the car on 4 jackstands, was going to put a jack under the rear untill the cars weight is off the jackstands then adjust everything. That is the correct way right?
I got the trans mount off my v8 doner car but that car was also a manual swapped car and they did a hack job (auto shifter was still wired in) car was trashed...guess I shouldnt have assumed it was the correct mount
Do you Know if there is any difference between v6 and v8 trans crossmember? I couldnt find anything definitive on Google
Sorry for all these questions...I posted a bit in the lt1 lt4 mods but hasnt gotten many replies
I did measure the angles....don't remember what they were after I chaged the mount(it's been 17 years).....but they were off.
I believe that the v6 auto and v8 manual crossmembers are different.
You can adjust your suspension by jacking up the rear. I've done it that way before. What are you setting your car up for? Street, dragstrip or autocross?
I did measure the angles....don't remember what they were after I chaged the mount(it's been 17 years).....but they were off.
I believe that the v6 auto and v8 manual crossmembers are different.
You can adjust your suspension by jacking up the rear. I've done it that way before. What are you setting your car up for? Street, dragstrip or autocross?
I know the auto and manual crossmembers are different but what about v6 manual vs v8 manual ? Only reason I ask is because i got my crossmember from the doner car that had the v6 trans mount so I'm hoping the crossmember is correct.
Yeah I have the car on jackstands, when I put the suspension in I'll jack up the rear till the weight is just off the Jack's then adjust. Right now ill just be driving on the street but end goal is to do some autocross with it.. but 90% street.
I ordered a magnetic angle finder from good old harbor freight, I have to measure the engine angle and subtract rear end angle and that gives me my pinion angle correct?
I know the auto and manual crossmembers are different but what about v6 manual vs v8 manual ? Only reason I ask is because i got my crossmember from the doner car that had the v6 trans mount so I'm hoping the crossmember is correct.
Yeah I have the car on jackstands, when I put the suspension in I'll jack up the rear till the weight is just off the Jack's then adjust. Right now ill just be driving on the street but end goal is to do some autocross with it.. but 90% street.
I ordered a magnetic angle finder from good old harbor freight, I have to measure the engine angle and subtract rear end angle and that gives me my pinion angle correct?
Good info in there. Should answer your questions about pinion angle
yeah I did check out that thread earlier today, good info, and I was about to locate some manufacturer markings and it is indeed the v8 crossmember luckily.
So after about 3 years of chasing my own tail with vibration issues, i am fairly certain it was because i unknowingly used a v6 mount instead of a v8 trans mount!
It may very well be your issue. Post your results after installing the new mount
well I am doing pretty much full suspension and a new rear end and clutch. Right now all that's in the car is the engine lol, so it will b a little bit to get all that done but I'm changing alot so I'm not sure I'll be able to fairly compare.
The mount on the bottom is the one you should get. It has bolt holes instead of a stud like the factory piece. Make sure you leave off the spacer supplied with the new mount as it may cause driveline vibration.
Finally finished my rear end break in so I took the car on the highway first time..and it vibrated horribly. I had a leak at the output shaft so I just did that job last night and originally I left the spacer off. I put the spacer on and brought the car up to 110 and it was pretty smooth. I think it's fine to drive now. Vibration is pretty much gone. But it's far from perfect lol so I'm going to try to shim the trans up...or maybe I'd be better off trying to adjust my pinion angle? I lucked out and eneded up at 0 on install settings so I left it at that. Glad I can finally drive this car on the highway though....I had 4.10s in the car previously and just left the vibration alone and didnt drive the car that fast...unless I was late lol. Well all those vibes loosed my ring gear bolts and popped one off and it shot outa my cover. All because I used the stupid v6 mount by accident..ruined my first rear end lol but 3.90s for the win!
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Have I been using the wrong trans mount?? 
