Join Date: Jun 2009
Location: Baton Rouge, LA
Mad Max is offline
Re: Best year of the Iron Duke?
CJ, early RWD 2.5s had the SBC bellhousing bolt pattern. You will find those in Monzas, AMC Jeeps, early AMC Spirits, Buick Skylarks, etc.
All of the later (after 85) Dukes had the FWD Bhousing bolt pattern.
Zach has it right... 110 HP in the last A code version. The 8th digit on your VIN is the engine code. This tells you what the truck had for original power.
The T5s were basically the same for all S10s, they are light duty versions. The Camaro/Firebirds and Ford T5s were totally different. They were heavier, had the shifter in a different location and the GMs were 'clocked' 18* to the right. You can make them work in a Dime, but they need considerable mods and different combination of parts (like the clutch and flywheel are different from the S10 counterparts).
There has been talk of the 2.5 and 2.8 trannys having different gear ratios in 5th, but I am unable to confirm that.
Otherwise, the 2.5 and 2.8 T5s are totally interchangeable.
More important than the tranny ratios (if you are looking for mileage) is the rear end gear ratio. Getting good mileage is a combination of factors. You need to have the best ratio for all around driving for best mileage. If you are going to go wheeling in the woods, forget about mileage. You will need the highest (numerically) ratio you can get for slow cruising. Like 4.56 to 1 or something.
Anyway, good luck with your build/project.
S10 addiction: (1)'82 S10, 383, 700R4, Shorty,
(2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck Truck), (3) '90 S10 2.5, 5 speed shorty,
(4) '91 S10, Built 3.4, 5 speed shorty (Voodoo Truck), (5) '92 S10, 2.5, 5 speed shorty, (Barbie Truck),
(6) '83 S10, 327, TH 350, shorty (13.00 best),
(7) '92 S10, 2.5 5 speed, Shorty,
(8) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.