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#1 |
Got big-block?
![]() Join Date: Jul 2000
Location: Austin, Texas
Posts: 2,453
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Anybody swap a 700R for a T400 in a mid 70's truck?
I have a '77 3/4 ton that has a 454/T400 drivetrain. I'd like to swap the T400 for a heavy duty rebuilt 700R I have. Was wondering if anyone on the board has done this. Guess I'll have to move the crossmember back and get a shorter driveshaft. Different yoke? Thanks for the help, SC.
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'68 CST SWB factory 396/T400 buddy buckets, a/c, ps, pb '72 Corvette convertible 454/4spd/ac, ps, pb '73 GMC Sierra Grande short wide 454/T400 ps, pb, ac '77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original '78 GMC Sierra Classic short wide 454/T400 ps, pb, ac '72 GMC Sprint SP454. 1 of 38 built. '73 GMC Sprint SP454. 1 of 71 built. '75 GMC Sprint SP454. 1 of 25 built. SOLD! '72 GMC K25 4x4 468/4L80e/NP205 build thread http://67-72chevytrucks.com/vboard/s...23#post4324423 SOLD!'55 Chevy gasser 496/4spd build thread http://67-72chevytrucks.com/vboard/s...96#post4324396 |
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#2 |
Registered User
Join Date: May 2004
Location: Lubbock, Texas
Posts: 2,121
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yup differnt joke
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'96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer |
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#3 |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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I think the 700 has the same yoke as your TH400. You might check it just to be sure. I think the main 3 things are; a) shorter driveshaft, b)move the crossmember (may have to drill a few holes) and c) you will need to swap the TV cable and bracketry to the big block. The aftermarket brackets are pretty reasonable, and seem to work well.
I actually got lucky swapping mine, as I pulled everything out of another 2wd Blazer, so the driveshaft already had the proper yoke and was the correct length. The only other thing I can think of is that you will not be able to hold it down in first with your existing shifter, if you have a column shift. My truck was not blessed with tilt when I got it, so I swapped the column too.
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1974 Jimmy- 5.3/4L80e/NP241 |
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#4 |
Registered User
Join Date: Jan 2004
Location: San Francisco
Posts: 19
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The 700R4 uses the same yolk as a TH350 and is the same lenth as a TH350 with the long tail shaft.. I believe the TH400 is also the same lenth as a 700R4 31 1/2 inches I believe.. If this is true then you will not have to shorten the drive shaft and proabably not even move the crossmember.. The 700R4 also uses the same mount as a 350... Only problem I see you having is the TH400 has the electronic kick down and you will not have the linkage for the TV cable which is Very important on a 700R4.. If not adjusted right you can fry the tranny in a matter of a few miles...
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#5 |
california fill
Join Date: Apr 2004
Location: Sunny So-Cal
Posts: 694
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well I have done something similar- I put a 700r4 into my 77 3/4 ton but its 4x4 and it originally had a th350. If I can be of any help, let me know
pc |
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#6 |
Registered User
Join Date: May 2004
Location: Lubbock, Texas
Posts: 2,121
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the joke IS differnt, and the Turbo 400 is shorter than the 700R4, i took some meaurements on that one, and also in the B&M shift kit i got it gave you template so you could make your own mount for the carb linakge, works just fine.
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'96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer |
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