So I found the rub... it was the damn mud flaps I put on. I had done so much to the truck so quickly that I didn't realize it. So there you go. 35x12.5's will defnintely fit a TRX4 with no rubbing. I'm still switching to the 33x11.5 Terra Grapplers though because of the speedometer/gas mileage etc. O and I went with the LT's. Why not?


Can anyone comment on whether they've put LT's on the truck and if it causes a fault with the TPMS?

 

I run the Pro Comp Extreme A/T's LT305-65-17's and have no issuse's. I also went with a wider rim 17X9's so it actually brought the truck down some which wife liked, really spread the foot print of the tire out and have no rubbing lock to lock. And the truck's safety features (esp,traction control etc.) work's just fine. One plus thing with these wider tires towing is alot better dosen't seem as wiggly in the rear end.

 

Same here, there on a 17x9.... so you have LT's....No issues with the TPMS?

 

It's going to depend on what pressure you put in them. The 35 psi on the door isn't going to be very good for a tire that is designed to be run at 50-60 psi. If you run the tires at the 50 psi that they want then your TPMS is going to come on.

 

I run the stock pressure 37 psi (per sticker on door panel) and I'm not having any issue's nice even tire wear.

 

What do the sidewalls of your tires say is acceptable pressure range? Not all LT's are going to want 50 PSI - but the ones the OP is looking at do.

 

I may be wrong but I thought the TPMS worked on pressure differential. I think if the truck is off when they are changed the higher pressure won't matter. Just if you let the air out or the pressure drops will they alarm. Don't take my word but I think that's how they work. Mine were set higher than factory when I changed rims and it hasn't caused a problem.

 

This would be great if someone could chime in who knew for sure.... thanks for the insight guys.

 

This is what it says in the manual:
TIRE PRESSURE MONITORING

The Tire Pressure Monitoring System (TPMS) will warn the driver of a low tire pressure based on the vehicle recommended cold tire inflation placard pressure. The placard pressure is defined on the Tire and Loading Information label. The Tire and Loading Information label is located on the drivers side B-pillar. Vehicles equipped to be operated in either the “max load inflation pressure” condition described on the Tire and Loading Information label or the alternative “light load inflation pressure” condition described on the Supplemental Tire Pressure Information label, may also be equipped with a reset switch to choose the appropriate TPMS low pressure warning threshold levels based upon the vehicle load condition. The Supplemental Tire Pressure Information label is located on the rear face of the driver door.

OPERATION

The tire pressure monitoring system (TPMS) is designed to operate without loss of function for all OEM tire construction for this vehicle. Tire Pressure Monitoring Sensors, mounted to each road wheel as part of the valve stem, transmit an RF signal indicating their individual pressure to a receiver located in the Wireless Ignition Node (WIN). These transmissions occur approximately once every minute at speeds over 15 mph (24 km/h). (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING/SENSOR - OPERATION). If the TPM system detects that the tire pressure in any road tire is going low, beyond the Low Pressure (lamp) ON threshold (see placard table below), the TPM system will continuously illuminate an indicator lamp. If a system fault is detected, the indicator lamp will flash on/off for 75 seconds and then remains on solid.
If the WIN detects a warning or fault condition at ignition key "on" it will wait ten seconds +/- 10 % before sending the first request to illuminate the yellow telltale. This will assure that the display module has concluded its bulb check period. The display module will request a chime once per ignition cycle for each "warning" or "fault" condition detected. A "warning" or "fault" condition will remain enabled until the problem causing the condition is corrected and removed/reset.
The WIN shall continuously monitor for the receipt of tire pressure RF message transmissions from the wheel sensors during both the ignition key "on" and key "off" cycles. The wheel sensor ID’s and the location of each sensor (e.g. Tire 1, Tire 2 etc.) are stored in the WIN non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required.
The TPM System will continue to warn the driver of low tire pressure as long as the condition exists, and will not turn off the indicator lamp until the tire pressure is at or above the Low Pressure (lamp) OFF threshold (see placard table below). The system will automatically update and the TPM warning lamp will extinguish once the updated tire pressures have been received.
The tire pressure will vary with temperature by about 1 psi (6.9 kPa) for every 12°F (6.5°C). This means that when the outside temperature decreases, the tire pressure will decrease. Tire pressure should always be set based on cold inflation tire pressure (placard pressure). This is defined as the tire pressure after a vehicle has not been driven for more than 3 hours - and in outside ambient temperature. The tire pressure will also increase as the vehicle is driven - this is normal and there should be no adjustment for this increased pressure. For a system fault, the system will return to normal once the WIN receives a valid transmission from that sensor location.
For further information, refer to the Owners Manual or the Appropriate Diagnostic Information.


TPM THRESHOLD PRESSURES



NOTE: To determine the pressure thresholds for a vehicle, refer to the Tire Inflation Pressure (Placard) Label found on the Driver's B-Pillar, or the Supplemental Tire Pressure Information Label located on the rear face of the driver door. then apply the placard pressure to the following table.

Placard Pressure (Cold) (PSI) Low Pressure ON Threshold (PSI) Low Pressure OFF Threshold (PSI)

28 22 26
29 23 27
30 24 28
31 25 29
32 25 29
33 26 30
34 27 31
35 28 32
36 29 33
37 29 34
38 30 35
39 31 36
40 32 37
41 33 38
42 34 39
43 35 40
44 36 41
45 36 41
46 37 43
47 38 44
48 38 45
49 39 45
50 40 47
51 41 48
55 44 52
60 48 57
65 52 62
70 56 67
75 60 72
80 64 77

 

I have never heard of the tire pressure system warning you about too much pressure. my buddy upgraded tires on his ford and went from a passenger tire to a light truck tire and started running 60 pounds in his tires which was up from the 35 punds stock and his light doesn't warn him about his tires having too much air in them.