Discussion in 'Member Trucks' started by PolarBear, Jan 31, 2020.
They really help. Btw rear diff 410?
This is a 3.73 truck.
Found out today its a factory full floater 14 bolt too, not a semi.
Shows how much attention I've paid to it.
Ok jw when I saw the pic of you rpms it had me thinking of mine.
I have the 342 and been wondering if I switch to a 373 how much would my rpms change around these speeds
That's not a big change, not worth the money in my opinion.
Spicer has a good calculator to figure your RPM at speed based on tire height, gear ratio, and transmission ratio at a a given speed.
Lots of others out there too.
Ok I'll have to look into it. I was jw anyways. I dont do a lot of crazy towing and the truck 2wd so hardly take her offroad
When my 98 had 3.42s and 265/75r16s, my RPMs would sit at about 1600 doing 55mph, my 97 with 3.73s and 265/75r16s sits at about 1700-1750 doing 55. Your RPMs (going from 3.42s to 3.73s) may only go up between 100-300 more depending on your speed.
You have it easier (and cheaper!) with yours being 2wd, if you found a cheap rear end with 3.73s in it, then I'd go for it, I hated my 3.42s, but liked the mileage. I once drove my 98 (when it was a half-ton with 3.42s) four hours to get a snowmobile and it got 17mpg, my 97 only hit 14mpg tops. If you do plan to upgrade, expect fuel economy to drop a little.
Thank you for your input. This helps me out and gives me and idea where I would be at.
Found my motivation for this project again.
Put together an exhaust system for the truck.
Jegs 2.5" "offroad" ypipe
3" flanged intermediate pipe
3" Flowmaster FlowFX muffler
3" Walker 92-93 3" OEM tail pipe.
Went ahead and welded flanges at the ypipe, and muffler to tail pipe. The exhaust is now easily removable for service.
What year range is the y-pipe from? That's pretty slick.
I'm still fighting the flush face flange between the cats on my 'burb. Going to try the Remflex 2045 gasket. If it doesn't work I'm going custom back from the head pipes, and doing a different muffler setup.
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