1993 YJ Fluid recommendations
 

Getting ready to change all of the fluids(differentials, transfer case
np231, transmission, coolant, brake, etc.) in a 93' YJ Sahara 4.0 5
speed and need some recommendations from the experts. Would like to
stay away from the synthetics, but if that seems to be the overall
favorite, I will abide. Rarely take it offroad, and getting ready for
the cooler weather in the NE. Currently don't have an owners manual,
or wouldn't be posting. Thanks for any responces!

Re: 1993 YJ Fluid recommendations
 

These are just my recommendations, I'm sure others have their own opinions.

Oil depends upon your climate and usage. The manual basically recommends a
good 10w-30, with a dip to 5w-30 in extreme cold.

Coolant is fairly simple, use Prestone or any green-colored standard
product. You don't need the orange stuff, which is for aluminum engines.
When you change it be sure to pull the plugs on the side of the block. It's
a major PITA to get them out sometimes, but it holds nearly two qts in there
that can't be removed any other way.
BTW, if it's never been done this may be a good time to change the hoses.
Expensive but worth the money if you plan to keep the rig. Change the
serpentine belt as well.

In the AX15 gearbox I use Redline MTL oil. It eliminates cold running gear
clash in second & third. I just dumped some that had been in my '94 YJs AX15
for 30k miles and there wasn't a trace of metal on the magnet. Great stuff,
get it at a local speed shop. FWIW, the factory recommends a 75w-90 GL5 gear
oil that can cause havoc with the synchros unless you add a recommended
additive available at the dealer. Not sure what it is since I've had such
good luck with Redline.

Transfer case uses Dexron III automatic trans fluid. The factory recommends
a Chrysler derivative but it's really not necessary to be that specific.

Recommended fluid for the axles is 75w-90 GL5 synthetic. Only other
requirement is that with Trac-Loc limited slips, where the factory
recommends adding a tube of Limited Slip friction modifier. (Need to check
to see if you have a Trac-Loc diff.) Get it at the dealer, parts house, etc.
Even though the gear oil will say it's compatible with the Trac-Loc, the
modifier needs to be added to prevent clutch pack chatter.

Lat thing I'd recommend is that you flush the brake fluid completely using a
high quality non-synthetic product. Rather than pump the fluid through the
system, which just stirs up all the muck & possible rust, either have the
system pressure bled, or vacuum bleed it yourself. You should also flush the
clutch system as well. Don;t be surprised at all the black crud that comes
out of the system!

All this is time consuming but worth it if you plan to keep the Jeep for any
length of time.
"pauley" <pauleytrapp@hotmail.com> wrote in message
news:afa39abe.0309251046.4ad95798@posting.google.c om...
> Getting ready to change all of the fluids(differentials, transfer case
> np231, transmission, coolant, brake, etc.) in a 93' YJ Sahara 4.0 5
> speed and need some recommendations from the experts. Would like to
> stay away from the synthetics, but if that seems to be the overall
> favorite, I will abide. Rarely take it offroad, and getting ready for
> the cooler weather in the NE. Currently don't have an owners manual,
> or wouldn't be posting. Thanks for any responces!

Re: 1993 YJ Fluid recommendations
 

These are just my recommendations, I'm sure others have their own opinions.

Oil depends upon your climate and usage. The manual basically recommends a
good 10w-30, with a dip to 5w-30 in extreme cold.

Coolant is fairly simple, use Prestone or any green-colored standard
product. You don't need the orange stuff, which is for aluminum engines.
When you change it be sure to pull the plugs on the side of the block. It's
a major PITA to get them out sometimes, but it holds nearly two qts in there
that can't be removed any other way.
BTW, if it's never been done this may be a good time to change the hoses.
Expensive but worth the money if you plan to keep the rig. Change the
serpentine belt as well.

In the AX15 gearbox I use Redline MTL oil. It eliminates cold running gear
clash in second & third. I just dumped some that had been in my '94 YJs AX15
for 30k miles and there wasn't a trace of metal on the magnet. Great stuff,
get it at a local speed shop. FWIW, the factory recommends a 75w-90 GL5 gear
oil that can cause havoc with the synchros unless you add a recommended
additive available at the dealer. Not sure what it is since I've had such
good luck with Redline.

Transfer case uses Dexron III automatic trans fluid. The factory recommends
a Chrysler derivative but it's really not necessary to be that specific.

Recommended fluid for the axles is 75w-90 GL5 synthetic. Only other
requirement is that with Trac-Loc limited slips, where the factory
recommends adding a tube of Limited Slip friction modifier. (Need to check
to see if you have a Trac-Loc diff.) Get it at the dealer, parts house, etc.
Even though the gear oil will say it's compatible with the Trac-Loc, the
modifier needs to be added to prevent clutch pack chatter.

Lat thing I'd recommend is that you flush the brake fluid completely using a
high quality non-synthetic product. Rather than pump the fluid through the
system, which just stirs up all the muck & possible rust, either have the
system pressure bled, or vacuum bleed it yourself. You should also flush the
clutch system as well. Don;t be surprised at all the black crud that comes
out of the system!

All this is time consuming but worth it if you plan to keep the Jeep for any
length of time.
"pauley" <pauleytrapp@hotmail.com> wrote in message
news:afa39abe.0309251046.4ad95798@posting.google.c om...
> Getting ready to change all of the fluids(differentials, transfer case
> np231, transmission, coolant, brake, etc.) in a 93' YJ Sahara 4.0 5
> speed and need some recommendations from the experts. Would like to
> stay away from the synthetics, but if that seems to be the overall
> favorite, I will abide. Rarely take it offroad, and getting ready for
> the cooler weather in the NE. Currently don't have an owners manual,
> or wouldn't be posting. Thanks for any responces!

Re: 1993 YJ Fluid recommendations
 

use GL-5 or 80W-90 in your transfer case, front diff and rear diff.
dexron III in the automatic transmission, unless you have a manual,
GL-5. no additives necessary as far as i know with stock dana 30 and 35
diffs. dot 3 in the brake system, standard green coolant in the radiator
--
Ben Jerew
ASE Master Technician
New Country Lexus of Latham, NY
Amateur Off-Roader 1993 YJ

Re: 1993 YJ Fluid recommendations
 

use GL-5 or 80W-90 in your transfer case, front diff and rear diff.
dexron III in the automatic transmission, unless you have a manual,
GL-5. no additives necessary as far as i know with stock dana 30 and 35
diffs. dot 3 in the brake system, standard green coolant in the radiator
--
Ben Jerew
ASE Master Technician
New Country Lexus of Latham, NY
Amateur Off-Roader 1993 YJ

Re: 1993 YJ Fluid recommendations
 

"MudPuppy1976 <"moc.rr.pacyn"@67lamina" <--BACKWARDS> wrote in message
news:n6Kcb.7643$oa4.8@twister.nyroc.rr.com...
> use GL-5 or 80W-90 in your transfer case

I've been told DexronIII for the t-case, by more than several
sources... why would you do otherwise?
__
Steve
..

Re: 1993 YJ Fluid recommendations
 

"MudPuppy1976 <"moc.rr.pacyn"@67lamina" <--BACKWARDS> wrote in message
news:n6Kcb.7643$oa4.8@twister.nyroc.rr.com...
> use GL-5 or 80W-90 in your transfer case

I've been told DexronIII for the t-case, by more than several
sources... why would you do otherwise?
__
Steve
..

Re: 1993 YJ Fluid recommendations
 

Watch out for the tranny fluid. GL5 is a no no in some like my T-5. It
messes up the synchromesh parts big time. Been there, done that with a
'GL4/GL5' compatible oil.

Didn't work for ----, started crunching going into gear when shifting.
Drained it and put GL4 in and it shifts sweet again.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"MudPuppy1976 <\"moc.rr.pacyn\"@67lamina" wrote:
>
> use GL-5 or 80W-90 in your transfer case, front diff and rear diff.
> dexron III in the automatic transmission, unless you have a manual,
> GL-5. no additives necessary as far as i know with stock dana 30 and 35
> diffs. dot 3 in the brake system, standard green coolant in the radiator
> --
> Ben Jerew
> ASE Master Technician
> New Country Lexus of Latham, NY
> Amateur Off-Roader 1993 YJ

Re: 1993 YJ Fluid recommendations
 

Watch out for the tranny fluid. GL5 is a no no in some like my T-5. It
messes up the synchromesh parts big time. Been there, done that with a
'GL4/GL5' compatible oil.

Didn't work for ----, started crunching going into gear when shifting.
Drained it and put GL4 in and it shifts sweet again.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"MudPuppy1976 <\"moc.rr.pacyn\"@67lamina" wrote:
>
> use GL-5 or 80W-90 in your transfer case, front diff and rear diff.
> dexron III in the automatic transmission, unless you have a manual,
> GL-5. no additives necessary as far as i know with stock dana 30 and 35
> diffs. dot 3 in the brake system, standard green coolant in the radiator
> --
> Ben Jerew
> ASE Master Technician
> New Country Lexus of Latham, NY
> Amateur Off-Roader 1993 YJ

Re: 1993 YJ Fluid recommendations
 

You have a chain drive T-case that needs ATF.

Gear driven ones like my Dana 300 take gear oil.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Stephen Cowell wrote:
>
> "MudPuppy1976 <"moc.rr.pacyn"@67lamina" <--BACKWARDS> wrote in message
> news:n6Kcb.7643$oa4.8@twister.nyroc.rr.com...
> > use GL-5 or 80W-90 in your transfer case
>
> I've been told DexronIII for the t-case, by more than several
> sources... why would you do otherwise?
> __
> Steve
> .