700r4 in 4x4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lash · 08-03-2003, 04:14 PM

I read the post in the faq forum on installation but didnt see anything about 4x4 installation. Is there any modifications needed or differnt tailshaft. Also how much rpm and torque loss is there between 1st & 2nd compared to a th350. I am running a stroker w/ 450+ hp. Thanks for any info. Lash

86k10 · 08-03-2003, 07:46 PM

Changing to a 700 r4 will require you to change both driveline lengths and move your crossmember. As far as loosing rpms and some power I would say yes you'll loose some since a 700 has a 1st gear ratio of 3.06 and a 350 has a 2.52 ratio first and i'm thinking 2nd is about 1.63 in both so I think you can see the difference. But if you have enough ponies under the hood you should be ok. I would say a stock one should handle your horsepower numbers but anything higher than that it should be beefed up a little.

sano_surfer · 08-03-2003, 08:57 PM

I have put a 700r4 in a 4x4 and it is no big deal.

leave the t-case in it's current location. by doing this you don't have to touch the drive line lengths and you don't have to cut a new hole in your hump for the t-case!

All you need to do is move your engine forward 1.5 inches, modify your autoshift linkage and add wiring for lock up torque converter. NO problema and the modification makes driving the truck a dream! I have the fact 3.73 gears and am running 32" tires and am really happy. Oh yeah one other thing that you might have to deal with is the exhaust hangers. mine had to be changed slightly due to moving the engine forward.

Take care. Tom Rutherford (aka 1971short4x4) i'm not san_surfer..just using his login..as he used my computer last.

Tom

08-03-2003, 04:14 PM	#1
lash Registered User Join Date: Feb 2002 Location: Central Illinois Posts: 163	700r4 in 4x4 I read the post in the faq forum on installation but didnt see anything about 4x4 installation. Is there any modifications needed or differnt tailshaft. Also how much rpm and torque loss is there between 1st & 2nd compared to a th350. I am running a stroker w/ 450+ hp. Thanks for any info. Lash

08-03-2003, 07:46 PM	#2
86k10 Registered User Join Date: Feb 2003 Location: Bertrand, Nebraska Posts: 355	Changing to a 700 r4 will require you to change both driveline lengths and move your crossmember. As far as loosing rpms and some power I would say yes you'll loose some since a 700 has a 1st gear ratio of 3.06 and a 350 has a 2.52 ratio first and i'm thinking 2nd is about 1.63 in both so I think you can see the difference. But if you have enough ponies under the hood you should be ok. I would say a stock one should handle your horsepower numbers but anything higher than that it should be beefed up a little. __________________ 98 Neon 97 Grand Prix GT 02 Grand Prix 40th Anniv. 86 GMC 5.0 77 Olds 98 6.6 REAL AMERICANS, DRIVE AMERICAN

08-03-2003, 08:57 PM	#3
sano_surfer Registered User Join Date: Dec 2001 Location: laguna hills ca Posts: 22	I have put a 700r4 in a 4x4 and it is no big deal. leave the t-case in it's current location. by doing this you don't have to touch the drive line lengths and you don't have to cut a new hole in your hump for the t-case! All you need to do is move your engine forward 1.5 inches, modify your autoshift linkage and add wiring for lock up torque converter. NO problema and the modification makes driving the truck a dream! I have the fact 3.73 gears and am running 32" tires and am really happy. Oh yeah one other thing that you might have to deal with is the exhaust hangers. mine had to be changed slightly due to moving the engine forward. Take care. Tom Rutherford (aka 1971short4x4) i'm not san_surfer..just using his login..as he used my computer last. Tom



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