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08-27-2005, 01:14 AM
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#1 |
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Senior Member
Join Date: Dec 2004
Location: Fremont, Ca
Posts: 260
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Tranny Help
My truck originally had an inline 6 and th-350. I am putting in a 475 horse 383 and wanted some advice on wheather or not I should put in a B&M th-400 from Summit or just get the 350 beefed up from a local shop. Also I wanted to know if the 400 will only fit with a high hump cab.
Thanks in advance Manny |
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08-27-2005, 01:28 AM
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#2 |
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10/30/19
Join Date: Aug 2004
Location: ottawa kansas
Posts: 5,245
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I may be wrong but,I think that you should not need a high hump for your 400 tranny.Also,by all means,GO WITH THE B&M shifter!!
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08-27-2005, 03:35 AM
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#3 |
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Senior Member
Join Date: Sep 2004
Location: Wakaw, Sask, Canada
Posts: 3,180
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I think it was TXFirefighter that said the low hump will work fine with a Th400 as long as the cab mounts are in decent shape and not compressed too much.
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"You can take the man out of PA, but you can't take PA out of the man" |
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08-27-2005, 05:28 AM
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#4 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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the Th400 never needed the high hump, that is for 4x4's, 4 speeds, and big block trucks...and V-6 1/2 ton automatic trucks on the GMC side of the house.
Personally, I like the TH350...I would stick with it. |
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08-27-2005, 11:33 AM
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#5 |
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Senior Member
Join Date: Dec 2004
Location: Fremont, Ca
Posts: 260
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Are there any pro's and con's one vs. the other? I've heard that the 400 was built stronger and would last longer. That was basically the only reason I was thinking of swapping.
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08-27-2005, 12:06 PM
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#6 | |
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Watch out for your cornhole !
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Quote:
Personally, I'd just beef the TH350 a bit and run it. It's a great transmission, and besides, you already have one. You can easily run a Turbo 400 under a low hump cab as long as you have pretty decent cab mounts. On my 70, when I did a swap like this, the cab hit the trans case. After replacing the 34 year old mounts, it cleared by a good bit. You'd be suprised how far these old trucks sag when they age.
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I'm on the Instagram- @Gearhead_Kevin |
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08-27-2005, 12:47 PM
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#7 |
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Registered User
Join Date: Aug 2002
Location: Farmers Branch, Tx
Posts: 1,009
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I have a th400 in my 67 gmc with the motor(350) in the six cylinder position (rear) and it clears by quite a bit. It would have a lot of clearance if it were in the correct location.
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08-27-2005, 02:45 PM
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#8 |
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Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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It takes more horsepower to turn a th400, I ran a th350 in my 6:71 blown 350 for 8 years on my 1930 Model A Ford (powered by Chevy)
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