TH400 to 700r4 Swap Questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

454c20 · 02-05-2009, 11:22 AM

I have a 87 1/2 ton 4wd that has the original TH400/NP208 combo. I am looking to swap in a 700r4 but I have a few questions.

Will I be able to use my current transfer case and adapter w/o any issues? Will the driveshaft lengths stay the same (IE will transfer case stay in the same location)?

If I need a new adapter, can I just get a 700r4, and transfer case adapter from the same error truck and just swap them in? Basically, I want to know if the driveshaft lengths will be affected. I had both built not too long ago.

Also, a local guy to me has a 700r4 from a 1988 3/4 ton 4wd pickup, and a NP208 transfer case from a 87 fullsize blazer. He said they bolt up but can anyone confirm this??

02-05-2009, 11:22 AM	#1
454c20 Registered User Join Date: Jan 2007 Location: Cape Cod Posts: 69	TH400 to 700r4 Swap Questions I have a 87 1/2 ton 4wd that has the original TH400/NP208 combo. I am looking to swap in a 700r4 but I have a few questions. Will I be able to use my current transfer case and adapter w/o any issues? Will the driveshaft lengths stay the same (IE will transfer case stay in the same location)? If I need a new adapter, can I just get a 700r4, and transfer case adapter from the same error truck and just swap them in? Basically, I want to know if the driveshaft lengths will be affected. I had both built not too long ago. Also, a local guy to me has a 700r4 from a 1988 3/4 ton 4wd pickup, and a NP208 transfer case from a 87 fullsize blazer. He said they bolt up but can anyone confirm this?? __________________ Thanks Nick '87 1/2ton 4wd-mild 355, TH400, long tubes, 3" single Magnaflow, manual locking hubs '88 SS-built 357, 2004r, 9.5" 3200 stall, 4.10 posi 8.5 '94 9C1-174k, built 4L60e, Hughes 2500 stall, 3.73 posi, 93oct tune, 2.5" true duals



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