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Old 12-13-2012, 01:49 PM
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Default I need transmission fluid knowlege

Hi all, I have a 94 2500 truck with a 47rh tranny that i bought just recently. I did a tranny fluid/filter change using atf4+ and lucas additive, it seems to be softer in the shifts and the TC seems softer too. before doing the fluid/filter change I drove it 2800 miles ...1800 with a small 6k trailer with no problems except no TC, so I added TC switch to fix that. When I pulled the pan the fluid was good color, no smell, and a dozen or so tiny brass bits in the pan, the magnet looked like a fuzzy dounut. the kid I bought the truck from probobly did somthing to firm up the shifts and grab to sell the truck (he claimed to work at a tranny shop) I cant find him now, I wish he would tell me what he was running for fluid and I would just reuse his recipe. My question is : how do I get it back to being solid feeling...i.e. change the fluid to somthing else like john deere, or some good aditives. I know atf4+ has some modifiers that might make it not so grippy. does the fluid in the TC drain out when changing fluid? I would do a rebuild but im poor for now...any Ideas?
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Old 12-13-2012, 02:01 PM
pri_i_oh pri_i_oh is offline
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yea I would like to know the same thing. I know mines tired and probably ready for a build but 1 thing at a time
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Old 12-13-2012, 02:09 PM
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According to my book, Haynes, you should be running ATF +3, type 7176(or equilivent). So you might change out the fluid and filter again and see what happens.

Not sure about the torque converter draining out when you change the fluids.

You might also try tightening up the bands in the transmission, since you have it opened up.

The front band should be tightened to 72 inch-lbs, then backed off 2 1/2 turns.

The rear band should be tightened to 72 inch-lbs, then back off 2 turns.

Hope this helps.
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Last edited by stodg73; 12-19-2012 at 05:03 PM.
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Old 12-13-2012, 03:44 PM
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thanks for the info stodg73, I think I might just have to pull the pan again, I will adjust the bands, I noticed last time that I have a square end bolt on the band adjustment, I was expecting a torq's bolt end, to be accurate with the torque wrench, I need use a small open end wrench attached to my torque wrench to make the adjustments right? if so does anyone know the math for the longer torque wrench arm, or am I missing a obvious work around? I should have checked to see if a socket base (i.e. the part that plugs into the wrench) fit, I could rig up somthing then. I read elsewere about using jon deere tranny fluid for extreme grippiness <--my word any thoughts on the subject?
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Old 12-13-2012, 03:52 PM
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No problems.

When you adjust the bands, make sure the front band locknut is torqued to 30 ft-lbs.

The rear adjustment locknut is torqued to 25 ft-lbs.

I am not sure about using the John Deere fluid.
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O.O., 01.5, Dodge, 2500, High Output (H.O.) Cummins Turbo Diesel (245/505), Quad Cab Long Bed (QCLB), 4x4, Sport, Original Bosch VP 44 Injection Pump, 6 Speed/NV5600 Transmission, 3.55 Gears, 105k, currently stock engine, Fram Air Filter, 285/75R16s, Glow Shift Gauges: Fuel Pressure (FP), Boost, Exhaust Gas Temperature (EGT), Oil Temperature, SMARTY@1, Airtex lift pump 19 psi @ idle, 14 psi @ WOT, Propane Injection, 2 Stroke Oil, Intake Air Temperature (IAT) Fooler = Better MPG, Bed Lined, Chrome Nerf Bars, more to come!!

Toys:
'79 CJ5, 258ci, 3" lift, 33x12.50x15, Stock Engine and 3 Speed Tranny
'05 Suzuki, GSX1300R, Hayabusa, All Stock, #3('00 blown engine, '00 stolen, & '05)
The complete live & learn and pass it on by H. Jackson Brown, Jr.
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Old 12-13-2012, 07:51 PM
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Quote:
Originally Posted by stodg73 View Post
According to my book, Haynes, you should be running ATF +3, type 7176(or equilivent).
You are going to have a difficult time finding ATF +3. ATF+4 is the replacement. What was the reason for the Lucas additive? Tranny shops use straight fluid. Far as the JD fluid, you probably can run it PROVIDED you manage to drain everything.
Tom
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Old 12-13-2012, 08:22 PM
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thanks tom, ....does the TC drain when you pull the pan?...or how do I drain everything? I also heard that you dextron III is pretty close to the john deere Hy-gard, viscosity wise, have you heard of any body running mercon or JD?

Just as a comparison,
Mercon-III ATF:
Viscosity: 7.23 cSt at 100C (212F) by ASTM D 445.
34.45 cSt at 40C (104F) by ASTM D 445.

Type F ATF:
Viscosity: 7.5 cSt at 100C (212F) by ASTM D 445.
36.5 cSt at 40C (104F) by ASTM D 445.


Hygard:
Viscosity: 9.4 cSt at 100C (212F) by ASTM D 445.
59 cSt at 40C (104F) by ASTM D 445.

Hygard Low-Viscosity:
Viscosity: 7.1 cSt at 100C (212F) by ASTM D 445.
33 cSt at 40C (104F) by ASTM D 445.
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Old 12-14-2012, 08:33 PM
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Use the cheapest multi purpose fluid you can find and add a bottle of Lube Gard friction modifier to the mix. The convertor will not drain when you drop the pan. Also only use MOPAR trans filters.
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Old 12-14-2012, 08:35 PM
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Thanks Chris!
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  #10  
Old 12-15-2012, 12:46 AM
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yep thanks chris, i found a instruction pdf on how to drain most of the fluid in your tranny on Ginos Garage ...it says to undue the return line from the cooler plug in a piece of hose and let the tranny pump itself mostly empty, then shut it down quick. that should mostly empty out the converter. has anyone heard of using type f to firm up a slipping TC lockup clutch?
I have heard good things about lube gard...are there more than one kind? (red tube and black tube?) or am i confusing another product...
Use only Mopar tranny filter...CHECK!
I do appreciate all the input, im trying to feel comfortable on the lunatic fringe
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