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Automatic Transmission - 3 Speed

1st Gear: 2.52
2nd Gear: 1.52
3rd Gear: 1.00

- Used in production GM models from 1969 thru 1979.
- 13 Bolt ...
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Re: Lsx Swap Thread 408 to ZF6

Subject: Re: Lsx Swap Thread 408 to ZF6
by bogus on 2022/1/5 18:36:21

The problem with the quicktime bell housing is the built in problem with the clutch in the first place - screwed up geometry.

There just isn't enough room, and using that layout will cause more math problems than I can think of. The fork angle would be whack as hell, I suspect.

As for the input shaft from the ZR1... you would need to get into the transmission, but I think it can be machined... meaning, you can cut it shorter and machine new splines in. I would look into that.

The Aussie flywheel would be a good fix. Make sure the rotating mass is internally balanced, and the new flywheel, whichever one you use, is neutral balanced. The DMFW is balanced to the LT1... and weighs over 40lbs. From my experience, you don't want to go much less than 20lbs, the aluminum flywheels are just too damned light and store no energy in them... Also can be tricky to get started smoothly.

In the old days, so to speak, to convert the Fbody steel flywheel, it was advised to cut .090 off the flywheel and then get it match balanced to the DMFW. Problems solved.

All I can suggest - don't go cheap on this build. If done wrong, you will spend more money making it right!!

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