rpm
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
3.55's work OK for me with a 4 speed
But it still turns lots of RPM's at interstate speeds. To have a good interstate cruising RPM a person almost needs an overdrive tranny.
2000 RPM 31" tires direct drive 4.10's = 44.98 MPH
2000 RPM 31" tires direct drive 3.55's = 51.95 MPH
2000 RPM 31" tires ZF 5 overdrive 4.10's = 59.19 MPH
2000 RPM 31" tires ZF 5 overdrive 3.55's = 68.36 MPH
The T 19 4 speed and C 6 were direct drive trannies
The ZF 5 5 speed diesel tranny was .76 overdrive
The M6HD 6 speed was .72
And the A4OD was .71
But it still turns lots of RPM's at interstate speeds. To have a good interstate cruising RPM a person almost needs an overdrive tranny.
2000 RPM 31" tires direct drive 4.10's = 44.98 MPH
2000 RPM 31" tires direct drive 3.55's = 51.95 MPH
2000 RPM 31" tires ZF 5 overdrive 4.10's = 59.19 MPH
2000 RPM 31" tires ZF 5 overdrive 3.55's = 68.36 MPH
The T 19 4 speed and C 6 were direct drive trannies
The ZF 5 5 speed diesel tranny was .76 overdrive
The M6HD 6 speed was .72
And the A4OD was .71
Posting Guru
Joined: Sep 2002
Posts: 1,897
Likes: 0
From: Northeastern Pa - USA
I had a gear vendors unit on my 88 and it allowed the engine to slow approximately 22% when it shifted into overdrive. I could shift in all 3 gears (c-6 auto) but first gear was realllllyyyy winding up the engine. The gear vendor unit would not shift til traveling about 23 mph to allow the speed sensor to work. The gear vendor unit can be selected to shift automatically or like a standard aux trans.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
I looked at those as well, but I think I am going to opt for the 5 or 6 speed tranny.
The gear splitting looks good, but you can only have under or over drive.
Using mine like I do I need more gears in both directions.
The 5 or 6 speed will give me a lower first gear and a higher high gear.
Money will be about the same either way.
The gear splitting looks good, but you can only have under or over drive.
Using mine like I do I need more gears in both directions.
The 5 or 6 speed will give me a lower first gear and a higher high gear.
Money will be about the same either way.
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