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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: mikeith on July 31, 2007, 03:54:13 pm

Title: need help on what speedo cable i need
Post by: mikeith on July 31, 2007, 03:54:13 pm

i have an 86 SWB and we just put a 700r4 in it w/ either 3.90 or 3.93 gears (cant remember what size the guy said they were) and the rear tire overall diameter is 29.88.... any you guys know how to calculate that out or where i need to look to get that done

Title: Re: need help on what speedo cable i need
Post by: Captkaos on July 31, 2007, 04:34:21 pm

Check this article out:
http://73-87.com/7387garage/drivetrain/speedo.htm

Title: Re: need help on what speedo cable i need
Post by: stevens on August 10, 2007, 07:12:40 pm

I got a 78 half ton p/u and i need a speedo cable for a 350/350 with 3.73 gears is there an article about that one? Thanks

Title: Re: need help on what speedo cable i need
Post by: Captkaos on August 12, 2007, 09:06:53 am

Same applies for all transmissions as far as the gear sets being replaced.  If you need a speedometer cable, the only options are cruise on non-cruise.

Title: Re: need help on what speedo cable i need
Post by: stevens on August 13, 2007, 11:14:08 am

yah i had cruise but it didnt work so i took it out and now left with a short speedo cable. If I go to the junk yard would i have to find a truck with the same gears?

Title: Re: need help on what speedo cable i need
Post by: Captkaos on August 14, 2007, 11:13:01 am

The gear ratio is irrelative to the speedo cable.  If you don't plan to keep the cruise, just get a non-cruise cable for you truck application.

Title: Re: need help on what speedo cable i need
Post by: stevens on August 14, 2007, 06:09:00 pm

Alright thanks got me one today


Stevens 78 halfton p/u 350