High Performance Big Block Cadillacs
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Author Topic: 500cid to Chev TH400 adapter plate? Trans-Dapt plate  (Read 4568 times)
Lebowski
C1
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Posts: 9


« on: May 29, 2010, 09:45:43 AM »

So I want to adapt the 500cid to a Chev TH400 4x4 tranny in a 1 ton. I think I will purchase this from Summit Racing for $100. Has anyone had good or bad issues with this adapter plate? Thanks in advance.
http://www.tdperformance.com/content/pdf6305.pdf
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dave brode
C5
*****
Posts: 1074


Best of 11.66, 113.96, 1.59 sixty


« Reply #1 on: May 29, 2010, 09:28:13 PM »

I would rather swap the case for a bop case.

Dave
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3960 lb '71 C-10. 11.7-1 CR 514". PEP I beam rods floating MTS 18cc dish Probes, Elgin solid cam, home ported heads, MTS 2.19/1.84", Potter/Probe shaft rockers, edel 2115, 4781 850. Switch-pitch TH400, 12" 1800/3200 Tri-Shield convertor, 4.30 gears. Best so far of 11.66, 114.8 mph and 1.59 sixty
Lebowski
C1
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Posts: 9


« Reply #2 on: June 14, 2010, 07:53:31 PM »

Dave, we were thinking of doing this but it will be cheaper/quicker to use the adapter plate. I don't envision any problems as I have seen adapter plates used in several other applications and all was good, even in the long term.

Just wondering if I should use the Chev torque convertor (say a 454 tc) or get a Cad convertor into the ChevTH400 case? Is there any difference between the two convertors? Bolt sizes are the same, but what about stall speed?
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~JM~
Shop Keeper
C5
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Posts: 1853


« Reply #3 on: June 15, 2010, 12:01:07 AM »

I used a Cadillac TH400 in my Jeep, but I had heard that some of the Chevy 4X4 TH400's had thicker cases than the standard 2wd TH400.

I was never able to verify this rumor, or to find any information on any type of special identifying feature(s) for these thicker cased tranny's....  Huh?

I do recall hearing negative reports on the thin adapter plate, but no positive proof.
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PS. You don't have enough cam. Grin

...Summit has a kit for $99.... Shocked
Lebowski
C1
*
Posts: 9


« Reply #4 on: June 15, 2010, 07:05:33 AM »

JM,
Yes, the TH400 4x4 cases are a thicker casting. I have seen a side by side comparison. I have the thicker style.

I should clarify and state that I have seen  adapters used with various engines but the NOT Cadillac adapters. As you state, strength/thickness may be an issue due to engine torque for the Cad adapters.

Which adapters are of the thicker design? The only two I am aware of are:
http://www.summitracing.com/parts/TRD-0061/ with torque convertor bushing.
http://www.summitracing.com/parts/TCI-230001/ looks like without torque convertor bushing. I think MTS sells a bushing one could use.

I'll probably go for an SFI flexplate instead of risking potential problems/stress cracks down the road. Maybe even a PowerMaster hi-torque mini starter.
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MTS Marty
C4
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Posts: 282


« Reply #5 on: June 15, 2010, 08:08:50 AM »

I actually like the thin adaptor plates for stick transmissions and the thicker plate with the nose cone for automatics.
The BOP & Chev trans share the bottom bolts and the dowels so strength is normally not an issue
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