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Re: Need Some Help Ref T5 Choices
gke59stpside #1389695 Thu Dec 24 2020 07:16 PM
Joined: Sep 2002
Posts: 31
Wrench Fetcher
I got My 'T5'Trans with Mech Speedo out of a 93' S-10,extended Cab.... Factory installed

Jimmy Gatz
Re: Need Some Help Ref T5 Choices
gke59stpside #1389873 Sat Dec 26 2020 06:43 AM
Joined: Apr 2005
Posts: 2,837
If knowing your speed is your main goal you might want to check out a GPS speedometer. The are dead accurate no matter what tires, transmission, or rear end and run about $60. Very easy to install. The largest in dash one is 85mm ( about 3 3/8") so a reducer ring is needed to mount in the factory 5" dash hole.

Re: Need Some Help Ref T5 Choices
52Carl #1389896 Sat Dec 26 2020 02:37 PM
Joined: Jan 2001
Posts: 1,562
ODSS President
Originally Posted by 52Carl
Make sure to chose your rear axle ratio to do what you want the T5 transmission and inline to accomplish.
Some think that 2,000-ish RPM at 60 MPH is a smart thing to do because it keeps the engine from screaming.
That is a mistake in my opinion (as well as others who have done it that way). These engines perform best and get the best gas mileage at 60 MPH at 2,400-2800 RPM. A vacuum gauge will confirm this.

This has been my exact experience. I've had a .70 overdrive transmission installed for twenty years. I installed a MOTORMINDER VACUUM GAUGE about eight years ago because it was a lighted gauge that I thought looked cool and it was colorful, indicating: 0-5 vacuum inches=Red=Poor, 5-10=Orange=Fair, 10-17=Green=Good, 17-21=Blue=Idle, and 21-30=Yellow=Decelerate. What I discovered to my astonishment is that to keep the engine happy in the GREEN Zone, THE MOST EFFICIENT ZONE, in many situations the engine LIKED MORE RPM's. I just did a search and the model very similar to my STEWART WARNER Gauge is selling for $81.14. After radial tires and the overdrive transmission this is easily the best purchase I have made for my truck as it has EASILY PAID FOR ITSELF IN FUEL SAVINGS.


" good horse Rocinante ('49 Chevy Half Ton), mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes

"If you come to a fork in the road, take it."...Yogi Berra
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