88GMCtruck
I'm all 8-Luggy!
- Joined
- Apr 14, 2010
- Messages
- 4,804
- Reaction score
- 1,322
You are somewhat in a middle ground, being a K2500 your truck likely came with 245/75R16 from the factory - It could have been optioned with 265/75R16. In either case, your current tire size and gear ratio puts you between 3.73s and 4.10s with a 245/75R16 tires size, the same as 4.10s with 265/75R16 or lower than 3.73s with 265/75R16.Am I not closer to a 4.10 then 3.73 ?
In any case, if you use the 350/4.10 gear chart instead, you'll be able to haul a 7,500 LB trailer and it'll put you at 13,500 LBS But keep in mind that your truck is heavier than a stock truck and is going to eat into that quite a bit, from a technical standpoint.
I towed a 19' Nomad with my 88 GMC. It was a regular cab stepside with 315/75R16 tires, a 14SF with 4.56 gears, 350 powered and a NV4500. It wasn't bad with a NV4500, the 700R4 has almost identical gear ratios sans the low first gear. Honestly the 350 moved it OK but wasn't great - keep in mind your truck is heavier than mine. At that time I had an actual GCW of around 10k, the trailer itself was something like 4,000 LBS or so.
What type/size trailer are you looking at?