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trooper Tdiesel · 08-07-2014, 03:14 PM

my isuzus use tire sizes in that same range.some years are OE with P rated tire others are OE with LT's

1984/1986 they have a 225/75/15P tire with a 26 psi rating

1987/1991 they have a 235/75/15LT with 4.55 gears or a 31/10.50/15LT with 4.77s making for about the same rpms with ether size...yes bolth tire sizes are on the door panel 87/91
the LTs have a OE psi rating in the upper 20s low 30s versus the P rated tires at 26.

other then the early years have lighter axils and carbed engines or a rare diesel burner all under 100hp. and the later ones have bigger axils with EFI or TBI engines over 120hp theres next to no difference in the autos....

the same rule applies to the 95 ford explorer i did an engine swap to, its OE with 235/75/15P tires and have a presser rating of around 26psi as well.

ive tried running P rated tires at 26 psi on my SUVs, other then having more grip on snow pack or off road, i can't stand it. as it feels like it wants to wander all over the road compared to 40 psi

08-07-2014, 03:14 PM	#18 (permalink)
trooper Tdiesel live, breath, Isuzu-Ds Join Date: Mar 2011 Location: oregon Posts: 231 puddle jumper - '93 Suzuki sidekick base model energizer bunny - '86 isuzu trooper base model Clifford the big red dog - '84 GM S-10 durango Thanks: 1 Thanked 20 Times in 17 Posts	my isuzus use tire sizes in that same range.some years are OE with P rated tire others are OE with LT's 1984/1986 they have a 225/75/15P tire with a 26 psi rating 1987/1991 they have a 235/75/15LT with 4.55 gears or a 31/10.50/15LT with 4.77s making for about the same rpms with ether size...yes bolth tire sizes are on the door panel 87/91 the LTs have a OE psi rating in the upper 20s low 30s versus the P rated tires at 26. other then the early years have lighter axils and carbed engines or a rare diesel burner all under 100hp. and the later ones have bigger axils with EFI or TBI engines over 120hp theres next to no difference in the autos.... the same rule applies to the 95 ford explorer i did an engine swap to, its OE with 235/75/15P tires and have a presser rating of around 26psi as well. ive tried running P rated tires at 26 psi on my SUVs, other then having more grip on snow pack or off road, i can't stand it. as it feels like it wants to wander all over the road compared to 40 psi __________________ 1 86 T\D trooper with rare GEN 3 rods TRANS FIXED NOW DD 1 86 4WD 5sp pup is 2.3L gas, but plan on 2.2L diesel repower 1 91 trop, long term plan is a group buy of imported Isuzu 4JB1-T 2.8L I-4 engines, hoping to get price down to 2K not 3K plus 1993 sidekick my MPG toy, epa rating 26. i get 29/31 with stock drive train.