| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | T-5 transmissions are not rated for large trucks, review last two day's comments. Changing the rear gears would be a start.
What ratio do you have now?
What wheel bolt pattern do you have?
What is the gross weight of your truck?
What kind of loads of you plan?
Do you have juice or air brakes?
Do you plan on a show or work truck?
Do you plan on much freeway driving?
These are some questions you might answer before deciding which route to follow. For example, look at trucks with similar GVW to yours. There are OD trans.' For several size trucks-NV-4500; RR RTO'; Eaton FSO, etc, depending on size of truck. Whatever trans you select, you might need to raise the diff. ratio.
Keep lurking on here.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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