What fluid do I use in an '85 NP833 MY6 tranny. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LMN8UR · 01-17-2009, 07:38 AM

I'm getting ready to convert my '72 to a three speed overdrive. Somewhere I read that this tranny (Supposedly out of an '85 truck) used automatic fluid. Now I'm confussed.

Hoping to do the convertion tomorrow, any advice?

Longhorn Man · 01-17-2009, 12:00 PM

I'm moving this to the 73 - 87 group... I'm sure they'd know.

**Green Machine** · 01-17-2009, 12:11 PM

I've had a couple of these trannys, one had Dexron and the the other had regular gear lube. I think Dexron was the original fluid.

Dexron seems to thin for me, and dino 75-90 too thick when cold. Synthetic 75-90 GL5 too slippery for synchros.

So the best lube IMHO would be Redline Manual Trans fluid. Thicker than dexron, buts flows well cold, and has less friction modifiers (slippery stuff) in it so the synchos can do their job.

01-17-2009, 07:38 AM	#1
LMN8UR Registered User Join Date: Jun 2005 Location: Midlothian, VA Posts: 148	What fluid do I use in an '85 NP833 MY6 tranny. I'm getting ready to convert my '72 to a three speed overdrive. Somewhere I read that this tranny (Supposedly out of an '85 truck) used automatic fluid. Now I'm confussed. Hoping to do the convertion tomorrow, any advice? __________________ 72 Chevy C-10 Custom LWB 383 Stroker - Edlebrock Air Gap intake and 670 CFM Holley Street Avenger carb. Hooker Comp Headers w/ X-Pipe and 2.25 duals TKO-500 & 3.08:1 rear I Love HEMI's, they're soft & chewy!

01-17-2009, 12:00 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What fluid do I use in an '85 NP833 MY6 tranny. I'm moving this to the 73 - 87 group... I'm sure they'd know.

01-17-2009, 12:11 PM	#3
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: What fluid do I use in an '85 NP833 MY6 tranny. I've had a couple of these trannys, one had Dexron and the the other had regular gear lube. I think Dexron was the original fluid. Dexron seems to thin for me, and dino 75-90 too thick when cold. Synthetic 75-90 GL5 too slippery for synchros. So the best lube IMHO would be Redline Manual Trans fluid. Thicker than dexron, buts flows well cold, and has less friction modifiers (slippery stuff) in it so the synchos can do their job. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0



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