Auto To Manual Swap... info on motor mounts! *Read Me!*

sanjay

Over the past few weeks 02Cavvy and I have been doing a major overhaul on his car. Before he purchased the car the previous owner had the converted form Auto to Manual by a mechanic who obviously didn't know there were difference with the mounts and mount brackets used in an Auto and a Manual. This misalignment of the engine for the past 3-4 years caused the drivers side inner CV boots to tear which eventually led to CV axle failure. This probably also led to premature engine mount failure.

Over the past few months we've been collecting the required brackets to finally align the engine properly in the bay. Below I will be showing pictures of the Auto vs Manual mount brackets and outlining what else is different with between the 2.

NONE OF THE AUTO MOUNT BRACKETS WORK PROPERLY WITH A MANAUL SWAP. There are 5 brackets that need to be addressed. Let's start with the tranny brackets. There is the main upper one and the dogbone lower one. GET THESE FORM THE SAME PLACE YOU MANUAL TRANSMISSION CAME FROM. Normally these brackets are not the problem.

There a 3 engine brackets that need to be addressed.The front aluminum one, the rear body bracket and the clamshell mount that shares a mounting bolt with the jack shaft support bracket. These are the 3 that most people assume are the same as in an auto car and are not due tthe engine and tranny sitting approx 5/8" further back in a manul car. The front (aluminum) bracket with have the letter M cast in for Manual and A cast obviouslty for Auto as seen in pics 1 & 2.

The body bracket for an auto is fastened to the car with 3 bolts and is stamped AUTO. The manual bracket is fastened with 4 bolts and is stamped MANUAL. See pic 3 & 4. You can't see the AUTO stamp in the pic but it is there.

The clamshell mounts are also stamped AUTO and MANUAL respectively. See pic 5.

The mounts themselves are a bit of a different story. The engine mounts, (pass side front and back) are the same for both Auto and Manul applications. The dogbone has a slotted inserts in the bushings so they can use for both applications as well.

The transmission mount now is debatable. According to parts stores the part number is different for the 2 but from the measurement I have taken they seem to be the same except that the alignment adjuster at the top is set up for the specific transmission. Don't quote me on this it's just an observation I made.

Ok so now we're done with mounts so let's go on to sub frames. The appear to be different. Well more accurately the pass side one appears to be different. There is a bracket welded to it which I can only assume has something to do with an Auto tranny as there is no reason for it to be there in a manual car. I cannot confirm this now but the next time I'm near an auto car I'll have a look. That being said I have yet to find a reason that the Auto subframe cannot be used in a Manual. There is plenty of clearance for everything including the axles throughout the suspensions range of movement.

One think I didn't expect was to have trouble with the exhaust but after I thought about it, it made sense. This currently is just an assumption but it's one based on observations. I believe the small extension pipe on the rear exhaust manifold is different between Auto and Manual cars. After having to undo the mounts and angle the engine so i could the get the exhaust attached we put the engine back into it's place and discovered that the exhaust now touched the firewall/heatshield. A slightly different extension pipe would solve this problem. I'm currently looking into this and will post my findings when I speak to my GM parts guy.

Now for the pics!!!

slowolej · Posted: Mon Jun 08, 2009 5:33 am Post subject:

Very nice information and great job on the pictures.

scott0999 · Posted: Mon Jun 08, 2009 6:57 am Post subject:

ya im beginning to think alot of the axle breakage I've heard about was from people with 5spd swaps and the wrong mounts/brackets

shawn3091 · Posted: Mon Jun 08, 2009 7:28 am Post subject:

i will be using this to correct my recent problem

SuperDave · Posted: Mon Jun 08, 2009 8:07 am Post subject:

Moved, i'll see if Moon will link to this thread in the original as well.

Thanks!

littlewhitegt · Posted: Mon Jun 08, 2009 1:32 pm Post subject:

I just noticed today, oh wow! my axle isn't hitting my ctrl arm anymore! the problem must have fixed itself

I looked underneath my car and there is bearing grease EVERYWHERE

great, I need to get on these mounts/brackets right away! do we have pics of the rubber mounts that go inside of the brackets?

torq455 · Posted: Fri Jun 12, 2009 9:47 pm Post subject:

sounds like a CV boot is torn with all the grease.

abob · Posted: Sat Jun 13, 2009 11:11 am Post subject:

Just to ad a little info to this....

There is a difference in some of the manuel mounts... If you have the older stamped Peice for the Jack shaft then the mounts have there own part number. If you have the one from a 94 the cast iron then it has it's own part number.
I ran into this problem when i was finding all my 5spd stuff. From what I've found all the mounts for the stamped Jack Shaft are no longer out there ( or just really really hard to find new). With the cast Iron Jack shaft I got lucky and was able to find the brackets new.

I can get a link for the part number difference later

Edit... for link

http://www.v6z24.com/jbodyforum/3400-bucking-update-still-bucking-t82760.html

Posted From Winchester Kentucky

littlewhitegt · Posted: Wed Jul 01, 2009 10:31 am Post subject:

ok now does anyone have any insight on how to actually INSTALL these mounts? I'm sure its not very hard, but im kinda pressed for time since its my only car.

kurdish_boy_19 · Posted: Thu Jul 02, 2009 4:17 am Post subject: helpfull tips

i having being thinking about switching from auto to manual and with all the helpful information you guys are putting out, It makes me look at it more and more carefully. I have found a 94 z24 all original with a 5spd and I have same year and everything but just an auto trans. My question is that I should be able to have everything from the 5spd z to put in my. ecu, shifter, pedal and cylinder, mounts (10 mounts ahahah). Is there anything that i might need assuming that I have a complete all original 5spd z for the parts. I appreciate all the information that people put out here

spankiniroc

littlewhitegt · Posted: Thu Aug 13, 2009 6:35 pm Post subject:

this is great but someone show me how and where to put them in!!!

robuz24

My name is Adam, and I did the 5 speed swap into my 1993 Z24. The tranny is from a 1990, but everything else is from a 1991. I read the instructions on this site to do the swap, and all I got was that the mounts needed to be changed. The instructions didn't mention the engine brackets too! I am asking for help from ANYONE to help me find the body bracket and front engine bracket to complete my swap!.. my driveshafts are hurting bad. When i drive, I do hear grinding, clicking and popping of the CV joints!

thanks in advance to all who can help me. my email is a.mohamed84@hotmail.com

lue22 · Posted: Thu Feb 25, 2010 11:26 pm Post subject:

i didnt know about the bracket difference i get popping in my shifts mostly when i 1st to 2nd gear pull this should be on the how to cuz the car i did my damn swap from is long gone from the jy and was wondering i hace a 89z and i did my swap to the 94 nvg so my question is do i have to get the intermediate shaft bracket from the 94 and adjust all the brackets or just the intermediate shaft only cuz i know its hitting the cv axle thanks for this info sticky this info or edit how to

robuz24 · Posted: Mon Mar 01, 2010 9:35 pm Post subject: intermediate shaft question...

Could you clarify your question about the intermediate shaft? Maybe be a bit more lay-man's terms, or be more descriptive? Im trying to picture your question in my head...picturing the intermediate shaft and rubbing the CV join...please clarify. my swap is using a 1990 Z24 Getrag 5 speed, other parts from a 1991 RS, and engine brackets from a 1992 Z24..I dont know too much about the NVG...

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