Do larger tires require transmission fluid changed early?

[4WD]

I would think the real killer is when the torque convertor is unlocked, the heat buildup during take off from a stop. I don't know if many transmissions now run unlocked in the upper gears? My Tundra sure did--but it also had a decent OEM cooler too. That just leaves frequent shifting as a concern (maybe lock out upper gears if it starts getting shift happy in the hills).

Is this getting a bigger trans cooler? These days it seems transmissions do use a thermostat so as to ensure the trans stays good and warm; thus I'm not sure you can overcool it. Once it goes off road that extra cooler might be nice.

Don't see how though that this could be any tougher on the transfer case.

New gears? Aftermarket? Done by a local shop? I think I'd worry first about those. Not saying they can't be done right the first time, just that I'd be concerned there first (even though they are probably the cheapest part of the system). And most likely to be dunked under water, as already noted.

I doubt crawling in 4Lo with his gears generates any more heat than me doing 10 MPH in 4Hi in deep sand - my temps are consistently oil, coolant, and transmission - in that order - same at 70 MPH on the highway …
It may vary with a 2.7:1 transfer case - but even with 4.10 gears and 35’s - mine is often over geared bcs of the 4:1 transfer case …

 

[AZjeff]

37” tires will be harder on brakes and shocks than the tranny IMO. Tires increased 12% and gearing final drive went 19% deeper the tranny shouldn’t notice. In any case servicing early is always better.

 

[Jeep Junkie]

I just had the trans serviced in my Wife’s 21 Grand Cherokee w/ 75k which is probably the same 8 speed in your wrangler. After watching the videos and not wanting to screw anything up. I just took it to the dealer. The Mopar fluid was just under $30 a quart and it took 6 quarts, the Mopar filter/pan was $250. They charged about $200 for labor. I’d just stick with the 60k. Since you added the larger gear to go with the tires, did your RPM’s even change that much?

My RPMS slightly increases due to 4.88

 

[Jeep Junkie]

Seems to me that the taller tire is offset by the deeper gearing, actually more so ofset. Then again, likely a heavier tire, so perhaps net sum zero during acceleration.

If this is a mall crawler then just stick to the manual. If this gets flogged off road often, then stock or not you’d be doing all fluids more often anyhow.

Got a trans temp gauge?

Yes it goes offroad a lot. My transmission temp never goes over 210, most of the time between 195 and 200

 

[2strokeNorthstar]

Good on you for changing the gears. Running 37s with stock gearing is what kills transmissions.

 

[4WD]

Yes it goes offroad a lot. My transmission temp never goes over 210, most of the time between 195 and 200

If that’s an 850RE - sounds about right.

 

[BMWTurboDzl]

Stock my Jeep had 33" tires and 4.10 gears. Now I have 37" tires and 4.88 gears. Will such heavy tires wear out the transmission quicker? Same question about transfer case fluid.

Thank you!

You'll have to perform some math. Difference in mass between the two wheels and the difference in the amount of torque transferred to the wheels, etc.

 

[4WD]

Tire size.com is at least step one post tire sizes …
JJ: Think you input the change in the Tazer ?

 

[Jeep Junkie]

Tire size.com is at least step one post tire sizes …
JJ: Think you input the change in the Tazer ?

Yes Jeep computer and T Case know about 4.88 and bigger tires. I have a Tazer hooked in

 

[Jeep Junkie]

The shop that did all this stuff for me is a Metal Cloak dealer and installer, he had super high reviews. Metal Cloak visits him every year. I've put over 10,000 miles since he did everything for me, my Jeep runs like a clock

 

[Jeep Junkie]

If it comes to letting somebody else do that transmission fluid change, then I would rather go to this shop than to the stupid Jeep dealer. Last time I saw them doing a 6.2 L LS swap on a Wrangler

 

[4WD]

Yes Jeep computer and T Case know about 4.88 and bigger tires. I have a Tazer hooked in

Cool - I’d get a decent sized white bowl and work the diffs and xfer case - followed info from others and went to good synthetic too early before shedding ended - these are nothing like my GM’s where you change once and always like champagne thereafter …
I dropped back to Valvoline 85-140 Dino to past 20k - then Delvac 1 - then that in front and Amsoil SG in the M220 …

 

[Jeep Junkie]

Cool - I’d get a decent sized white bowl and work the diffs and xfer case - followed info from others and went to good synthetic too early before shedding ended - these are nothing like my GM’s where you change once and always like champagne thereafter …
I dropped back to Valvoline 85-140 Dino to past 20k - then Delvac 1 - then that in front and Amsoil SG in the M220 …

Hey, I'm kind of crazy, instead of one breakin differential oil change, I did two, one at 600 Mi and the other at 2,000 miles . The pissed shop guy showed me the oil and said this is what you changed, see how clean it is

 

[4WD]

If it comes to letting somebody else do that transmission fluid change, then I would rather go to this shop than to the stupid Jeep dealer. Last time I saw them doing a 6.2 L LS swap on a Wrangler

If you can change oil - you can do that trans - lots of drama on the internet but it’s really not rocket science

 

[4WD]

Hey, I'm kind of crazy, instead of one breakin differential oil change, I did two, one at 600 Mi and the other at 2,000 miles . The pissed shop guy showed me the oil and said this is what you changed, see how clean it is

Oh, I did them until the white bowl had no metal

 

[Jeep Junkie]

If you can change oil - you can do that trans - lots of drama on the internet but it’s really not rocket science

Good thing about my Jeep is that it is way up high, so much room to work under it. Thank you, I think I could give myself a whole summer day to figure it out

 

[4WD]

Good thing about my Jeep is that it is way up high, so much room to work under it. Thank you, I think I could give myself a whole summer day to figure it out

If this guy can do it - you can …
His reasoning may be a bit less than perfect - but he did it right …
The Mopar is over priced - ZF on eBay is great and cheaper …

 

[Jeep Junkie]

If this guy can do it - you can …
His reasoning may be a bit less than perfect - but he did it right …
The Mopar is over priced - ZF on eBay is great and cheaper …

Watched that, he says the fluid came low from factory, these stalantis Crooks my coolant came low from factory, that's why I'm in a rush to get all the factory fluids out as soon as possible, I think I'm going to do it at 20k miles next year in summer

 

[camrydriver111]

Larger tires will be heavier so theoretically there will be more load on the drivetrain. Whether it warrants early change I'm not sure.

How about diff and transfer case and PS fluid?

We can design your entire fluid change schedule.

 

[4WD]

Larger tires will be heavier so theoretically there will be more load on the drivetrain. Whether it warrants early change I'm not sure.

How about diff and transfer case and PS fluid?

We can design your entire fluid change schedule.

Take the brace position before talking Mopar EPSP fluids …
Worst than 8 speed ATF …