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Transmissions and drive-trains Troubleshoot, repair, rebuild.

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Old 10-09-2010, 04:27 PM   #1
beersy50
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Default Manual transmission

I've spent the last couple of hours reading past threads were people have asked about putting a manual trans in behind a caddy motor, the responce was the same for all of them "it can be done but its hard and expensive, just stick with the th-400''. I love driving a manual, so I'm not that easy to convice. With out telling me I can't do it or that I shouldn't do it, will someone that has done it or has figured out how to do it, tell me at least what parts I need to go with my 472 and a junkyard suggestion of a tranny. I appoligize if I upset any one or sound like some cocky kid. I AM going to beat my brother beefed up honda that hits almost 9,000 rpms and I AM going to do it with a Caddy in a 99 Sanoma!
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Old 10-10-2010, 07:55 AM   #2
Nashalac
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It can and has been done - BUT - there is NO junk yard trans that will stay together behind the Caddy, except "maybe" one from a Viper.
You will need a BOP bellhousing with starter on pass side and pattern for trans used. Drill the crankshaft for whatever pilot you need for the trans of choice. Flywheel is Cadillac specific as no other has the bolt pattern
Just a few ideas to get you started.
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Old 10-10-2010, 09:45 AM   #3
beersy50
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What about a trans from a diesel truck like from an IDI ford? Not worried about the gear ratio yet.
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Old 01-30-2011, 06:55 PM   #4
mechanical rebellion
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I drill ahole I think its 9/16 in the back of the center of the crank (I'll check on that hole size if you really need me to). Then I put a SBC bushing in it . I have a 7 1/2" triple disc clutch which has had the clutch housing bolt pattern redrilled to the Caddy flange . Then I bolt a stock Caddy flywheel to the crank flange and then the clutch . I use a typical SBC throwout bearing and use a old style early 60s to early70s GM 3 cast iron truck trans . I have used aluminum Muncies . I've never broke any grears but have broke some mounting ears of due to chassis flex and inproper mounting . So all that can be remadied . And of course I use a Cad adapter plate . This was all on a dirt track stockcar .
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Old 02-13-2011, 05:52 PM   #5
midnitetrucker76
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I've got a Chevy flywheel that's been drilled and machined to fit the caddy crank. I've yet to use it and been told I'm gonna have to do a fair amount of shimming off the starter to make it work. I've heard of guys using a Buick or pontiac flywheel and drilling for the cad crankflange. There also a couple companies out there producing flywheels for the caddy now. I'm gonna run a sm465 behind one in my pickup when the engines done. A friend that used to sand drag jeeps run the t-18 trannys and says to go in and grind every other tooth off the synchronizers and they'll shift a lot faster. But it wears the synchronizers out faster. But since mine is strictly a toy I may try it
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Old 02-18-2011, 02:47 PM   #6
mechanical rebellion
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I wounder if you could use a stock automatic caddy flywheel so you'll have a good starter to flywheel teeth mesh , then bolt your newly drilled SBC manual flywheel on to that . Thats really what I do but with a smaller clutch assembly . I bet it would work . You might have to make a spacer for between the 2 flywheels ,,,,,, maybe not though . Good luck
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Old 01-26-2012, 12:13 AM   #7
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Default Just my fix

Well i did one better i think. Due to the engine being out and torn down i have figured out the conversion and i am putting a nv4500 diesel trans behind it. It will hold cuz its use to the torque of the cummins motor.Will post pictures of the setup next week when i get back up to my shop and take them.
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Old 01-30-2012, 07:44 PM   #8
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I have a bit of experience with a T56. Im a Buick guy through and through with an interest in Cadillac, and so ive spent a fair bit of time figuring out how to make a T56 live behind torque, and bolt up to a BOP. If you go to pro-touring.com, theres a guy with a 66 GTO that shows you how its done (T56 to a Pontiac).

You need an LS1 T56 (1997-2002++), The GTO t56's are nice but hard to find, and the clutch is slightly different, or a Viper T56 to start. Then you need to build it up. Viper T56 is ideal, for ease of adaptibility. The others can be made to work, but it involves more pieces for the adaptation.

Realistically, the T56 was built tough enough, and unless you use slicks youre not going to hurt it. Its used in a wide varitey of cars, and comes in slightly different configurations. Used in corvettes, vipers, mustangs, camaros, aston martins, etc..

The ZF is also an excellent trans, it was found in the corvette ZR1 of early 90s, diesel trucks, and some rare cars.
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Old 01-31-2012, 10:53 AM   #9
~JM~
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Quote:
Originally Posted by cadracer View Post
....i am putting a nv4500 diesel trans behind it...
That was my original plan for my Jeep. Parts were a lot more expensive & harder to come by back then. I ended up using the TH-400 like most everyone else. I'd be interested in seeing your pics.

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