70 GMC 4x4 ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Husker · 11-29-2011, 08:53 PM

I have a 70 GMC4x4 1/2 ton 4 speed tranny not sure of transfer case. The question is: between the transfer case and transmission can the oil move back and forth with out restriction? Otherwise can the oil from the transmission get into the transfer case?
I checked oil in transfer case and it ran out like it was too full and transmission was not full enough. It took about a quart to top off.
Thanks for any help.
Ron

Chevy1TonFun · 11-29-2011, 09:29 PM

I am assuming you have a manual trans. The adaptor between the trans and t case (mostly likely a NP205) does have two seals that keep the fluids separate. Sounds like your seals are shot.

**Stocker** · 11-30-2011, 11:34 AM

Quote:

Originally Posted by Chevy1TonFun

I am assuming you have a manual trans. The adaptor between the trans and t case (mostly likely a NP205) does have two seals that keep the fluids separate. Sounds like your seals are shot.

Same problem occurs with TH350 coupled to a NP205..... seals go bad and trans fluid is pumped into the t-case. To the OP -- it doesn't flow both directions, though.

Husker · 11-30-2011, 12:01 PM

I should be able to drop t-case to get to both seals?
Thanks
Ron
Posted via Mobile Device

JDeere550 · 11-30-2011, 11:12 PM

yes sir! ^

JDeere550 · 11-30-2011, 11:13 PM

get a jack or jack stand underneathe that trans to support it though cause the adaptor fromtrans to t-case is what bolts to that crossmember, which i think you'll have to drop down quick

Husker · 11-30-2011, 11:21 PM

Thanks for help gents! Not sure when I wil lbe able to get to it for sure.
Ron

11-29-2011, 08:53 PM	#1
Husker Registered User Join Date: Dec 1999 Location: Mid NE USA Posts: 2,212	70 GMC 4x4 ? I have a 70 GMC4x4 1/2 ton 4 speed tranny not sure of transfer case. The question is: between the transfer case and transmission can the oil move back and forth with out restriction? Otherwise can the oil from the transmission get into the transfer case? I checked oil in transfer case and it ran out like it was too full and transmission was not full enough. It took about a quart to top off. Thanks for any help. Ron __________________ Member #111 68 C-10 Daily Driver 70 4x4 Project 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson

11-29-2011, 09:29 PM	#2
Chevy1TonFun Grease Monkey Join Date: Oct 2007 Location: Fresno CA Posts: 750	Re: 70 GMC 4x4 ? I am assuming you have a manual trans. The adaptor between the trans and t case (mostly likely a NP205) does have two seals that keep the fluids separate. Sounds like your seals are shot. __________________ Tow Rig: 2012 Chevy 2500HD CCSB LTZ Z71 4x4 Duramax Ultimate Offroad Build: 1978 Chevy Silverado K30 Crewcab Build Link http://67-72chevytrucks.com/vboard/s...d.php?t=654053 Mud Truck: 1972 Chevy Cheyenne K30 4x4, 468/400/205, D60/D70HD, 18" Custom Lift, 17x39" IROKs FOR SALE http://67-72chevytrucks.com/vboard/c...ton-4x4&cat=12

11-30-2011, 12:01 PM	#4
Husker Registered User Join Date: Dec 1999 Location: Mid NE USA Posts: 2,212	Re: 70 GMC 4x4 ? I should be able to drop t-case to get to both seals? Thanks Ron Posted via Mobile Device __________________ Member #111 68 C-10 Daily Driver 70 4x4 Project 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson

11-30-2011, 11:12 PM	#5
JDeere550 Registered User Join Date: Aug 2011 Location: Sacramento, California Posts: 79	Re: 70 GMC 4x4 ? yes sir! ^ __________________ 1970 C/20 4x4, 350, sm465, np205(She tipped over... total rebuild from the frame up!) ya gotta keep on keepin' on, Life's a garden, dig it!

11-30-2011, 11:13 PM	#6
JDeere550 Registered User Join Date: Aug 2011 Location: Sacramento, California Posts: 79	Re: 70 GMC 4x4 ? get a jack or jack stand underneathe that trans to support it though cause the adaptor fromtrans to t-case is what bolts to that crossmember, which i think you'll have to drop down quick __________________ 1970 C/20 4x4, 350, sm465, np205(She tipped over... total rebuild from the frame up!) ya gotta keep on keepin' on, Life's a garden, dig it!

11-30-2011, 11:21 PM	#7
Husker Registered User Join Date: Dec 1999 Location: Mid NE USA Posts: 2,212	Re: 70 GMC 4x4 ? Thanks for help gents! Not sure when I wil lbe able to get to it for sure. Ron __________________ Member #111 68 C-10 Daily Driver 70 4x4 Project 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.