Ls1 with a th400 trans

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Aug 22, 2008 | 03:52 AM

74batmobile

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Racer

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From: milpitas ca

Ls1 with a th400 trans

i think i remeber reading bout it but im not sure is this even possible?

Aug 22, 2008 | 08:05 AM

Durango_Boy

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From: Columbia Missouri

Quote:

Originally Posted by 74batmobile

i think i remeber reading bout it but im not sure is this even possible?

I think it is. A 4L60 will bolt up to a Gen1 block, and a 4L60 will bolt up to an LS engine. By that same logic, I would assume that a TH400, would fit an LS engine just fine.

Aug 22, 2008 | 08:22 AM

Kenzy

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From: Gananoque Ontario

Car Craft just did an article on this in their Oct 08 issue. Its not quite a dirrect bolt in, the gen III/IV flexplate is .400 too short for a 350/400/200r/700r. (From me reading the article only)

The article has a parts list and prices from a couple of sources, looks like about $200 for a spacer and flexplate to make an older tranny fit.

Grab the mag it should be still on the stands.

Aug 22, 2008 | 11:48 AM

7T1vette

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From: Crossville TN

Why?????

Aug 22, 2008 | 04:46 PM

74batmobile

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Racer

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From: milpitas ca

Quote:

Originally Posted by 7T1vette

Why?????

cause i was thinkin if it would be worth it or not....

Aug 22, 2008 | 05:37 PM

7T1vette

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From: Crossville TN

I can't imagine going to the trouble of switching engines [in a C3] and NOT putting in the whole LS1 engine/tranny/controller 'power pack'.

Aug 23, 2008 | 08:36 PM

Iskenderian

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From: Fort Drum New York

Quote:

Originally Posted by Durango_Boy

I think it is. A 4L60 will bolt up to a Gen1 block, and a 4L60 will bolt up to an LS engine. By that same logic, I would assume that a TH400, would fit an LS engine just fine.

The 4L60E that bolts to a Gen 1 block (1993-1997) and the 4L60E that bolts to an LSx (1998 +) are two different cases. But are controlled the same way through the computer. As far as the TH400 on an LSx, I do think a spacer is required.

-Bob

Aug 23, 2008 | 09:22 PM

FRSTR90

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From: Springfield Illinois

The bellhousing flange on the sbc gen 1 somewhat covers the flexplate were as on the ls engine it is comepletely open... I dont know if that helps, but it does explain why a spacer is needed.