Author Topic: Transfer Case Break in & fluid??  (Read 627 times)

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idahank

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Transfer Case Break in & fluid??
« on: Mar 18, 2020, 10:00:31 PM »
Hay you all I was just wondering what is the break in procedure and what fluid you guys recommended I use in my freshly rebuilt Marlin Transfer Case
1980 body,1983 running gear with 4.11 Detroit Truetracs front and rear, New Marlin Transmission & T-Case with 4.7 gears, 30x9.5 R15 Cooper Discoverer STT LT, custom front & rear bumpers.

RUGER

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Re: Transfer Case Break in & fluid??
« Reply #1 on: Mar 19, 2020, 09:31:03 AM »
id use 80-90 but not sure what t-case yer running.
id run it fer a bit and change the fluid and good to go.

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idahank [OP]

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Re: Transfer Case Break in & fluid??
« Reply #2 on: Mar 21, 2020, 09:14:58 AM »
Just heard back from Marlin and they suggest to break in with conventional 75w90 for the first 1000 miles then they recommend using Redline 75w90 fluid. So I thought someone out there might want to know.
Thanks
1980 body,1983 running gear with 4.11 Detroit Truetracs front and rear, New Marlin Transmission & T-Case with 4.7 gears, 30x9.5 R15 Cooper Discoverer STT LT, custom front & rear bumpers.

calux

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Re: Transfer Case Break in & fluid??
« Reply #3 on: Aug 14, 2020, 11:54:17 AM »
i know this is an old thread but how is the redline oil working out, about to install duals and am debating that vs  Neo Synthetics 80-90

blackdiamond

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Re: Transfer Case Break in & fluid??
« Reply #4 on: Aug 14, 2020, 08:05:01 PM »
i know this is an old thread but how is the redline oil working out, about to install duals and am debating that vs  Neo Synthetics 80-90

Youll never notice a difference with expensive gear oil in your transfer case. You will feel a difference with MT-90 in your manual transmission.
1989 4Runner: Dual Ultimate (Inchworm front & Marlin 4.70 rear), Marlin Twin Stick, 1200-lb clutch, 4.88 R&P, Aussie Front, Detroit rear, 30-spline Longs, Long hub gears, ARP hub and knuckle studs & 35x12.50 Cooper STT PRO tires.  Marlin rear bumper & sliders.  FROR front bumper.  SAS with Alcan springs & Rancho 9000XL shocks.  Budbuilt Bolt-on traction bar.  Custom Interior Cage by Those Guys Rod and Customs.

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Gnarly4X

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Re: Transfer Case Break in & fluid??
« Reply #5 on: Aug 15, 2020, 01:41:00 AM »
I have run everything from 20w-50 Castrol motor oil, Redline MTL, to Mobil 1 Synthetic.  The difference in shifting is very noticeable between conventional 75-90 and Redline or Mobil 1. If I lived in a very cold climate, Id be running ALL synthetics, they flow easier at cold temps. Im running Mobil 1 now and shifts up and down are smoother than with the conventional 75-90 gear oil.  I live in the Phoenix area and Redline and Mobil 1 did lower the temperatures on the tranny shifter and the t-case shifter when grabbed with my hand at the base of the shifters, especially during our 100+ summer months.

https://www.mobil.com/en/lubricants/for-personal-vehicles/our-products/products/mobil-1-syn-gear-lube-ls-75w-90/

https://www.redlineoil.com/mtl-75w80-gl-4-gear-oil

By the way, in my rebuilt 5-speed, the tranny shop installed Toyota Factory synchros, and the shifts were a little notchy for about 1,000 miles. I switched from conventional 75-90 to Redline MTL (recommended by Redline Tech) and it really made the shifts much smoother.

Personally, I would NOT drain and refresh my tranny or t-case oil after a "break-in" period.

Gnarls.
« Last Edit: Aug 15, 2020, 01:57:51 AM by Gnarly4X »
1986 XtraCab SR5 22RE 5speed W56B, ~26,000 MI after break-in, DIM (Did It Myself) rebuilt engine - .020" over, engnbldr RV head, OS valves, 261C cam, DT Header. https://imgur.com/oACTHTR

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Wainiha

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Re: Transfer Case Break in & fluid??
« Reply #6 on: Aug 15, 2020, 03:56:29 AM »
I always ran Redline MT 90 because I was told there was no sulfur inside.  Meaning if water got inside it would not turn to sulfuric acid and harm the brass syncros.  Not sure if this is true.  it worked well for me though.
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Gnarly4X

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Re: Transfer Case Break in & fluid??
« Reply #7 on: Aug 15, 2020, 05:33:41 AM »
I always ran Redline MT 90 because I was told there was no sulfur inside.  Meaning if water got inside it would not turn to sulfuric acid and harm the brass syncros.  Not sure if this is true.  it worked well for me though.

According to Redline's site, only difference between MTL and MT-90 is viscosity.

https://www.redlineoil.com/Content/files/tech/Manual_Transmission_Tech_6.20_.pdf

Gnarls.
1986 XtraCab SR5 22RE 5speed W56B, ~26,000 MI after break-in, DIM (Did It Myself) rebuilt engine - .020" over, engnbldr RV head, OS valves, 261C cam, DT Header. https://imgur.com/oACTHTR

MEMBER: NRA, GOA, SAF "I'm sorry, if you were right, I'd agree with you" ~ Robin Williams

Wainiha

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Re: Transfer Case Break in & fluid??
« Reply #8 on: Aug 15, 2020, 08:41:48 AM »
I thought the "to slippery" came from the sulfur and that is what posed a possible problem to the the syncros as in GL-5 lubes.  Maybe I'm remembering incorrectly.
2000 3.4L xtra-cab Tacoma.
Icon C/Os
Marlin 1200lb. clutch
Marlin short shifter
FLOODED...GONE

2005 4.0L xtra-cab Tacoma
King Resi C/Os and Total Chaos UCAs
Waiting on Marlin for the RA60 Short throw shifter...Hint Hint
FLOODED...GONE

2012 4.0L xtra-cab 4x4 Tacoma
Automatic...Don't shoot...
 King resi C/O
and Total Chaos UCAs

^ Who let Wainiha into the mainland?? :yikes: - Big Mike

 
 
 
 
 

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