TH350-NP203 to TH700R4-NP208 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1985K10 · 02-05-2006, 12:01 AM

My 77 GMC has a TH350-NP203 setup, but I was considering swapping to a TH700R4-NP208 setup. I have a 700R4-208 truck(1984), I know id have to use the 208 crossmember and drill the frame, but what about the trans tunnel, could I bolt in the "cover" from the NP208 truck? And are the u-joints(driveshaft to diff) the same??

I would like to use the 77 axles, and is the shifter the same? I know the marker thing would need to be changed(P R N L1 L2 vs. P R OD D 2 1)

Im sure someone has done this!!!

Thanks!

02-05-2006, 12:01 AM	#1
1985K10 Registered User Join Date: Oct 2003 Location: CT Posts: 315	TH350-NP203 to TH700R4-NP208 My 77 GMC has a TH350-NP203 setup, but I was considering swapping to a TH700R4-NP208 setup. I have a 700R4-208 truck(1984), I know id have to use the 208 crossmember and drill the frame, but what about the trans tunnel, could I bolt in the "cover" from the NP208 truck? And are the u-joints(driveshaft to diff) the same?? I would like to use the 77 axles, and is the shifter the same? I know the marker thing would need to be changed(P R N L1 L2 vs. P R OD D 2 1) Im sure someone has done this!!! Thanks! __________________ Anthony 07 Tahoe LT 70 Chevelle 450HP 383-TH400 77 GMC Royal Sierra~Resto in progress~



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