4x4 not engaging, 1990 1500 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

silveroddo · 02-07-2005, 01:06 AM

Hey everyone, I've got a 1990 chev, reg cab long box auto 4x4, I just put a new rear main in and after putting it back together the 4x4 is not engaging at the front axel, the transfer case engages but as far as I can tell the front end isn't locking, I havn't had the chance to put it in the air to check it out yet, hopefully tomorrow I can do some further investigating, It looked like all of the plugs were connecting but I need to double check all that, before I did the rear main the 4x4 worked fine, it did want to lag a little on engagement, I.E. it took a second to fully enagage or you might have to shift it from reverse to forward to get it to click, but I've seen that quite a bit on these older trucks. Any info?
I'mnot totally sure how the front end works as far as locking, a friend of mine was telling me about a kit that locks the front end all the time then when you engaged the transfer case there wasn't any lag time, just looking for some ideas, info,and maybe a better understanding of what I'm dealing with here.
BTW if it matters its a 305 and a 700R4. Thanks for looking, any info is appreciated.

*1FaastC10* · 02-07-2005, 01:09 AM

actuator has likely gone south, very commom problem with these trucks.

silveroddo · 02-07-2005, 01:12 AM

Wow, that was fast
how expensive/easily replaced is it? I was looking through a haynes but cant find anything about it

1972 · 02-07-2005, 02:44 AM

Very easy to replace, about $100 with a new wiring harness when I did one a couple years ago. It is a piece that threads into your front differential that engages when 4x4 is selected.

NorthWolf33 · 02-09-2005, 04:07 AM

is the front driveshaft not spinning? or is the fronst shaft spinning and its not locking at the wheels?

NorthWolf33 · 02-09-2005, 04:08 AM

oh to find that out....jack all four tires off the ground and see what spins and what doesnt when ya put it in 4

02-07-2005, 01:06 AM	#1
silveroddo Registered User Join Date: Mar 2003 Posts: 10	4x4 not engaging, 1990 1500 Hey everyone, I've got a 1990 chev, reg cab long box auto 4x4, I just put a new rear main in and after putting it back together the 4x4 is not engaging at the front axel, the transfer case engages but as far as I can tell the front end isn't locking, I havn't had the chance to put it in the air to check it out yet, hopefully tomorrow I can do some further investigating, It looked like all of the plugs were connecting but I need to double check all that, before I did the rear main the 4x4 worked fine, it did want to lag a little on engagement, I.E. it took a second to fully enagage or you might have to shift it from reverse to forward to get it to click, but I've seen that quite a bit on these older trucks. Any info? I'mnot totally sure how the front end works as far as locking, a friend of mine was telling me about a kit that locks the front end all the time then when you engaged the transfer case there wasn't any lag time, just looking for some ideas, info,and maybe a better understanding of what I'm dealing with here. BTW if it matters its a 305 and a 700R4. Thanks for looking, any info is appreciated.

02-07-2005, 01:09 AM	#2
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	actuator has likely gone south, very commom problem with these trucks.

02-07-2005, 01:12 AM	#3
silveroddo Registered User Join Date: Mar 2003 Posts: 10	Wow, that was fast how expensive/easily replaced is it? I was looking through a haynes but cant find anything about it

02-07-2005, 02:44 AM	#4
1972 Majician Join Date: Nov 2004 Location: In the Middle Posts: 329	Very easy to replace, about $100 with a new wiring harness when I did one a couple years ago. It is a piece that threads into your front differential that engages when 4x4 is selected.

02-09-2005, 04:07 AM	#5
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	is the front driveshaft not spinning? or is the fronst shaft spinning and its not locking at the wheels?

02-09-2005, 04:08 AM	#6
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	oh to find that out....jack all four tires off the ground and see what spins and what doesnt when ya put it in 4



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.