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What are you using for oil in your 4 speed? #2967812 09/27/21 01:00 PM 09/27/21 01:00 PM
Joined: Jan 2003 Posts: 1,619 MA R ragtop OP top fuel
ragtop OP top fuel R Joined: Jan 2003 Posts: 1,619 MA	I have a 1971 833 23 spline 4-speed 340 car. My trans up shifts great, but have a tough time down shifting. I am currently using 85W-90 gear oil compatible with brass stop rings. The coldest temperature that I would drive it would be 50 degrees and the warmest would be 90 degrees. I was wondering if auto trans fluid would make it down shift easier. Last edited by ragtop; 09/27/21 01:18 PM.

Re: What are you using for oil in your 4 speed? [Re: ragtop] #2967814 09/27/21 01:04 PM 09/27/21 01:04 PM
Joined: Apr 2003 Posts: 12,234 Looking for a way out of Middl... IMGTX I Live Here
IMGTX I Live Here Joined: Apr 2003 Posts: 12,234 Looking for a way out of Middl...	I used to run Gear oil in the summer and auto transmission in the winter and occasionally a mix if the shift wasn't to my liking. The old 833's like a good fluid but are pretty flexible.

Re: What are you using for oil in your 4 speed? [Re: ragtop] #2967825 09/27/21 01:31 PM 09/27/21 01:31 PM
Joined: Jan 2003 Posts: 25,783 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,783 Rio Linda, CA	Redline 75W-90NS synthetic. The INTERNET, the MISinformation superhighway

Re: What are you using for oil in your 4 speed? [Re: ragtop] #2967840 09/27/21 02:13 PM 09/27/21 02:13 PM
Joined: Oct 2005 Posts: 269 Anchorage, Alaska metallicareload enthusiast
metallicareload enthusiast Joined: Oct 2005 Posts: 269 Anchorage, Alaska	I think I've used 85W-90 once year round, I just switched back to 85W-140. Below freezing it's like trying to stir molasses? until the trans warms up some. But it still shifts fine on the road. I put 37,000+ miles with RedLine 75W-90 NS. All that being said, I've never noticed a significant difference between any of the fluids. It might shift "better" now with the 85W-140, maybe I don't know how to drive Last edited by metallicareload; 09/27/21 02:17 PM. 440, 4-Speed, 3.54 1968, when Dinosaurs ruled the Earth

Re: What are you using for oil in your 4 speed? [Re: ragtop] #2967858 09/27/21 02:58 PM 09/27/21 02:58 PM
Joined: Oct 2003 Posts: 4,013 South Park, Pa. 68LAR master
68LAR master Joined: Oct 2003 Posts: 4,013 South Park, Pa.	Originally Posted by ragtop I have a 1971 833 23 spline 4-speed 340 car. My trans up shifts great, but have a tough time down shifting. I am currently using 85W-90 gear oil compatible with brass stop rings. The coldest temperature that I would drive it would be 50 degrees and the warmest would be 90 degrees. I was wondering if auto trans fluid would make it down shift easier. . If it up shifts okay but hard down shifting, the brass rings are probably gone and need replaced. Auto transmission fluid will make it shift easier, if everything was okay before you put the ATF in. If everything was not okay, then I doubt it will make a difference. If you want to try a different fluid, try 2 1/2 qts of regular engine oil. Maybe like a 30 weight. It is GL 4 like ATF and syncro oils. 4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight

Re: What are you using for oil in your 4 speed? [Re: 68LAR] #2967861 09/27/21 03:04 PM 09/27/21 03:04 PM
Joined: Dec 2004 Posts: 2,368 Wheatfield, NY Cuda340 top fuel
Cuda340 top fuel Joined: Dec 2004 Posts: 2,368 Wheatfield, NY	Originally Posted by 68LAR Originally Posted by ragtop I have a 1971 833 23 spline 4-speed 340 car. My trans up shifts great, but have a tough time down shifting. I am currently using 85W-90 gear oil compatible with brass stop rings. The coldest temperature that I would drive it would be 50 degrees and the warmest would be 90 degrees. I was wondering if auto trans fluid would make it down shift easier. . If it up shifts okay but hard down shifting, the brass rings are probably gone and need replaced. Auto transmission fluid will make it shift easier, if everything was okay before you put the ATF in. If everything was not okay, then I doubt it will make a difference. If you want to try a different fluid, try 2 1/2 qts of regular engine oil. Maybe like a 30 weight. It is GL 4 like ATF and syncro oils. This is correct.

Re: What are you using for oil in your 4 speed? [Re: Cuda340] #2967930 09/27/21 06:50 PM 09/27/21 06:50 PM
Joined: Dec 2009 Posts: 339 Gilroy,CA. mopardude318 enthusiast
mopardude318 enthusiast Joined: Dec 2009 Posts: 339 Gilroy,CA.	Pennzoil Synchromesh. 408 Stroker 533 HP 520 FT LBS...........................1970 Dart RMS AlterKation

Re: What are you using for oil in your 4 speed? [Re: mopardude318] #2968000 09/27/21 09:23 PM 09/27/21 09:23 PM
Joined: Jul 2005 Posts: 1,499 Slidell, LA Plum440 pro stock
Plum440 pro stock Joined: Jul 2005 Posts: 1,499 Slidell, LA	85W-90 here. No problems and smooooth shifting! 70 Challenger, 440, 4-speed, pLuM cRaZy 71 VW Super Beetle Convertible, Lemon Yellow A couple of Jeeps…

Re: What are you using for oil in your 4 speed? [Re: Plum440] #2968010 09/27/21 10:02 PM 09/27/21 10:02 PM
Joined: Jan 2003 Posts: 9,116 Tucson, AZ Ramrod39 My New Title
Ramrod39 My New Title Joined: Jan 2003 Posts: 9,116 Tucson, AZ	The tired (I guess) 833 in my road runner did not shift as silky smooth as I would have liked when using 90 weight. I put ATF in it and it made a small difference. It did leak slightly with the thinner ATF though.

Re: What are you using for oil in your 4 speed? [Re: Ramrod39] #2968046 09/28/21 05:19 AM 09/28/21 05:19 AM
Joined: Jan 2003 Posts: 6,391 Abilene, Texas F fastmark master
fastmark master F Joined: Jan 2003 Posts: 6,391 Abilene, Texas	I tried Amzoil synthetic in mine and it would not shift well at all. Went back the the lighter 85-90w and it went back to shifting fine.

Re: What are you using for oil in your 4 speed? [Re: ragtop] #2968074 09/28/21 09:08 AM 09/28/21 09:08 AM
Joined: Jan 2003 Posts: 1,013 LEE, MASS T TOMRR super stock
TOMRR super stock T Joined: Jan 2003 Posts: 1,013 LEE, MASS	I use the oil Jamie Passon sells in my 833 4-speed

Re: What are you using for oil in your 4 speed? [Re: ragtop] #2968092 09/28/21 10:21 AM 09/28/21 10:21 AM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	RedLine MTL https://www.redlineoil.com/mtl-75w80-gl-4-gear-oil

Re: What are you using for oil in your 4 speed? [Re: 451Mopar] #2968133 09/28/21 12:24 PM 09/28/21 12:24 PM
Joined: Dec 2007 Posts: 18,157 Mass DAYCLONA I Live Here
DAYCLONA I Live Here Joined: Dec 2007 Posts: 18,157 Mass	I've been running 85/90W GL-4 for the last 42 years in my Challenger T/A.... I change it out about every 10 years

Re: What are you using for oil in your 4 speed? [Re: DAYCLONA] #2968575 09/29/21 06:54 PM 09/29/21 06:54 PM
Joined: Apr 2006 Posts: 4,220 West Plains, MO DrCharles master
DrCharles master Joined: Apr 2006 Posts: 4,220 West Plains, MO	Another vote for Pennzoil Synchromesh here.

Re: What are you using for oil in your 4 speed? [Re: DrCharles] #2968593 09/29/21 07:45 PM 09/29/21 07:45 PM
Joined: Jan 2003 Posts: 3,682 South San Francisco, Ca 70sixpkrt master
70sixpkrt master Joined: Jan 2003 Posts: 3,682 South San Francisco, Ca	StaLube 85-90 GL-4 [img]http://www.imgur.com/hxlGUJt.gif[/img] 4-speed 3:54 Dana 13.01 @107.93 with street tires (not hooking up)

Re: What are you using for oil in your 4 speed? [Re: 70sixpkrt] #2968754 09/30/21 12:47 PM 09/30/21 12:47 PM
Joined: Jul 2009 Posts: 794 massachusetts U.S.A. 1 1969ronnie super stock
1969ronnie super stock 1 Joined: Jul 2009 Posts: 794 massachusetts U.S.A.	Another Pennzoil Synchromesh user . But when I ONLY want Mopar Fluid in my MOPAR's the Manual Tranny Lube Part # 0487446AB also works Great , just like the Pennzoil .

Re: What are you using for oil in your 4 speed? [Re: DrCharles] #2968781 09/30/21 02:22 PM 09/30/21 02:22 PM
Joined: Jan 2003 Posts: 4,714 Moved to N.E. Tennessee GomangoCuda master
GomangoCuda master Joined: Jan 2003 Posts: 4,714 Moved to N.E. Tennessee	Originally Posted by DrCharles Another vote for Pennzoil Synchromesh here. Same here. In theory, there is no difference between theory and practice. In practice, there is.

Re: What are you using for oil in your 4 speed? [Re: 451Mopar] #2968798 09/30/21 03:27 PM 09/30/21 03:27 PM
Joined: Jan 2003 Posts: 31,021 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,021 Oregon	Originally Posted by 451Mopar RedLine MTL https://www.redlineoil.com/mtl-75w80-gl-4-gear-oil I've been using MTL for years in my Coronet. Seems to work okay.

Re: What are you using for oil in your 4 speed? [Re: GomangoCuda] #2969292 10/01/21 03:23 PM 10/01/21 03:23 PM
Joined: Jan 2003 Posts: 13,360 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,360 Marion, South Carolina [><]	Pennzoil synchromesh in the my dad's 4 speed six pack road runner. Works great. CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

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