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02-10-2018, 11:23 PM | #1 |
Registered User
Join Date: Nov 2014
Location: Vernon, CT
Posts: 85
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8.1L 4L85E 5.13 gears 37” tires
Have a 91’ K5 with 8.1, 4L85, 5.13s and 37” tires. This truck will eventually see some decent highway time and possibly some towing 5-8k. Currently cruises at 70mph in the 2200-2300 range. Is this a healthy number for towing/ extended highway time or should I be looking to make some changes ?
Thanks it advance |
02-11-2018, 12:09 AM | #2 |
Registered User
Join Date: Jun 2003
Location: ga
Posts: 630
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Re: 8.1L 4L85E 5.13 gears 37” tires
you should be fine as-is the 8.1 will pull whatever you want and 2000-2300 rpm at 70mph is not bad
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4x4k30 if trouble was money i would have plenty |
02-11-2018, 12:13 AM | #3 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,582
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Re: 8.1L 4L85E 5.13 gears 37” tires
according to my calculator if your trans has a .75 od you should be turning 2446rpm at 70...good enough I wouldn't change anything. ...and not worth the cost to change it....
http://www.csgnetwork.com/multirpmcalc.html
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
02-11-2018, 12:26 AM | #4 |
Registered User
Join Date: Nov 2014
Location: Vernon, CT
Posts: 85
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Re: 8.1L 4L85E 5.13 gears 37” tires
For some reason I thought OD was .70, but I stand corrected (thank you for the calculator). I guess I’ll leave it be
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02-11-2018, 12:31 AM | #5 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,582
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Re: 8.1L 4L85E 5.13 gears 37” tires
my quick search on the od ratio said the 4l80 and 4l85 are the same at .75....
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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