1985 sliverado 4x4 - Pirate4x4.Com : 4x4 and Off-Road Forum

85silverado · 07-13-2006, 04:31 PM

my 1985 sliverado 4x4 has a np 208 transfer case that is going bad ...i heard that the 205 or 203 is a better transfer case...is that true? and what mods would i have to do to install either the np203 or a 205?

94runnerguy · 07-17-2006, 07:13 AM

yes np 205 is better simply because np 208 are chain driven.

Brendanpotter · 07-19-2006, 02:03 AM

So heres a quick rundown on the cases just off the top of my head...

NP203 is an inexpensive case, chain driven, but is a full time case without putting a mod in it to make it a part-time case (meaning that both from and rear driveshafts ar'nt movign at all times). Features fixed yokes on both ends. 2:1 low range, but you'll need to change your rear driveshaft due to the fixed yoke in the rear of the case. Downsides: This T-Case is very large and weights a ton. As 94runner guy said, go NP205 if possible.

NP205 is damn near seen as indestructable, this case is most desireable because its gear driven. Came in 10, 27 or 32 splines and is fixed yokes on both ends. 1:1.96 low range. Once again, but you'll need to change your rear driveshaft due to the fixed yoke in the rear of the case. Note: you can find NP205's with a slip yoke on them, but I havent seen a whole lot. Plus, Slip yoke is not fun for wheeling anyway.

NP208. Desireable for its 2.6:1 low range, chain driven (no fun when they stretch), part time case (both driveshafts dont spin all the time). Fixed yoke output for the front driveshaft, slip yoke for the rear. Lightest of all 3 cases (weight wise), however its weakness was in the case, as the thin aluminum case tends to crack :-(

Hope this was a help. Here are some more webpages that may help....

This is a quick info guide I found after I wrote all of the above (doh)

http://www.high-impact.net/transmiss...case_np208.htm

cuc-v · 07-19-2006, 01:36 PM

and also to my understanding the 205 can drive at higher speeds becuase its gear driven... dont ask me how fast tho!

85silverado · 07-23-2006, 02:59 PM

what all would i need to change out my 208 to a 205?

07-13-2006, 04:31 PM	#1 (permalink)
85silverado Registered User Join Date: Jul 2006 Member # 75637 Posts: 10	1985 sliverado 4x4 my 1985 sliverado 4x4 has a np 208 transfer case that is going bad ...i heard that the 205 or 203 is a better transfer case...is that true? and what mods would i have to do to install either the np203 or a 205?

07-19-2006, 02:03 AM	#3 (permalink)
Brendanpotter Registered User Join Date: Dec 2005 Member # 63984 Location: Downtown San Jose Posts: 50	So heres a quick rundown on the cases just off the top of my head... NP203 is an inexpensive case, chain driven, but is a full time case without putting a mod in it to make it a part-time case (meaning that both from and rear driveshafts ar'nt movign at all times). Features fixed yokes on both ends. 2:1 low range, but you'll need to change your rear driveshaft due to the fixed yoke in the rear of the case. Downsides: This T-Case is very large and weights a ton. As 94runner guy said, go NP205 if possible. NP205 is damn near seen as indestructable, this case is most desireable because its gear driven. Came in 10, 27 or 32 splines and is fixed yokes on both ends. 1:1.96 low range. Once again, but you'll need to change your rear driveshaft due to the fixed yoke in the rear of the case. Note: you can find NP205's with a slip yoke on them, but I havent seen a whole lot. Plus, Slip yoke is not fun for wheeling anyway. NP208. Desireable for its 2.6:1 low range, chain driven (no fun when they stretch), part time case (both driveshafts dont spin all the time). Fixed yoke output for the front driveshaft, slip yoke for the rear. Lightest of all 3 cases (weight wise), however its weakness was in the case, as the thin aluminum case tends to crack :-( Hope this was a help. Here are some more webpages that may help.... This is a quick info guide I found after I wrote all of the above (doh) http://www.high-impact.net/transmiss...case_np208.htm __________________ Build it...Break it...Fix it...Repeat.

07-19-2006, 01:36 PM	#4 (permalink)
cuc-v Registered User Join Date: Mar 2006 Member # 70310 Location: C-Valley,CA Posts: 140	and also to my understanding the 205 can drive at higher speeds becuase its gear driven... dont ask me how fast tho! __________________ 86 chevy short bed, 14bff/10b, 350/465/208 86 m1028 14bff/10b, 6.2/400/208

07-23-2006, 02:59 PM	#5 (permalink)
85silverado Registered User Join Date: Jul 2006 Member # 75637 Posts: 10	Re: 208 t-case what all would i need to change out my 208 to a 205?

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

07-17-2006, 07:13 AM	#2 (permalink)
94runnerguy Registered User Join Date: Jul 2006 Member # 75213 Location: Spring Lake, NC Posts: 163	yes np 205 is better simply because np 208 are chain driven.