I thought that was in my sig... Guess i'll have to put it back...
Tach just started working...rmp question.
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Cargo Master
Joined: Mar 2006
Posts: 2,789
Likes: 5
From: Sand GAp, KY
Tach just started working...rmp question.
Ok the tach in my truck just started working all on its own tonight. It has not worked since I did the body swap. I want to make sure it is reading right. So does 21-2200 rmps at 60mph sound right. I have 3.55 gears with these 37" tires and the final ratio for the trans should be 1:1 with this t18. At 55 it reads right around 18-1900 rmps.
Posting Guru
Joined: Jan 2010
Posts: 1,665
Likes: 4
From: Terre Haute, IN
I think im at about 1850 at 55mph...
I use this to double check sometimes: Calulators from www.4Lo.com
Edit: that calc says im at 1940 rpm at 60 mph.....
I always thought i was just a hair under 2k at 60 mph....dunno
I use this to double check sometimes: Calulators from www.4Lo.com
Edit: that calc says im at 1940 rpm at 60 mph.....
I always thought i was just a hair under 2k at 60 mph....dunno
Posting Guru
Joined: Jan 2008
Posts: 2,408
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From: Trenton, MI
My old 87 F250 had 3.55 with 235' tires
Rpm were around 2100-2200 at 55 mph. I am pretty sure it close to that.
Rpm were around 2100-2200 at 55 mph. I am pretty sure it close to that.
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Cargo Master
Joined: Mar 2006
Posts: 2,789
Likes: 5
From: Sand GAp, KY
Before the body swap I had 33's on it and the 88 tach worked. It ran at 2600 rmps with the same 3:55 gear. It is gonna be hard to give up that gear ratio when I swap in the 4:10's later this year. But I need the lower gears for towing in these hills and the ones futher south.
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