What's a good tranny?

[Skunksmash]

You can't have a transmission shop "change" the final drive on the 6L80E, you also don't want to drop the OD ratio any lower. 

You could run 4.56's in the 700R4 and it would be like 3.23's in OD and you wouldn't need a $3000+ controller to operate it.

If i had an RPM gauge i could see what i would be happy with. But of course they decided to leave that out for some reason.

[eventhorizon66]

If i had an RPM gauge i could see what i would be happy with. But of course they decided to leave that out for some reason.

Buy a cheapie, wire it up, and zip tie it to the steering column.  That's what I did.

[Skunksmash]

How hard is that? I never can get a straight answer on what all is involved. I mean, where do you run the wire to?

[frogman68]

Usually

Green goes to the Distributor (Cant recall what its marked but you will know it should be the only one not connected)
Red Ign 12v
Black Ground
White instrument circuit.

[Lt.Del]

the distributor wire as mentioned is green, and the HEI caps are labelled accordingly..."TACH".

it can't get any easier than that.  All tachs have instructions, as mentioned red to ignition source 12v, white to headlight switch or instrument cluster for backlight, black ground as always. 

[Skunksmash]

Gear Ratios: for 6l80e
1st: 4.02
2nd: 2.36
3rd: 1.53
4th: 1.15
5th: 0.85
6th: 0.67


Thought of another question. Just because these are listed as the factory gear ratios on the 6L80e, does that mean that it is set in stone that those are the ratios that i would get if i went to the junkyard and bought one? Maybe they are different from car to car. Maybe the vette 6l80e has different ratios than the one that they put in the cadillac? Anyone know? The caddy is luxury, the vette is performance. So it stands to reason the vette that they might want to gear the vette differently.

[SUX2BU99]

4.02:1 first gear. Hoo boy, almost like a tranny with a granny gear!

Yep, putting in a tach is easy. Says 'TACH' right on the HEI cap. You will see two tabs there. One says TACH. Put a female spade connector on the end of the green wire and shove it in there. Wire up power (red) to an open spot in the fuse box (on the fused side of an accessory switched location) and ground it. White wire to the headlight switch is about the hardest part, and it's only hard to determine under the dash which wire you tap into and how accessible it is. Mine is still unconnected.

[Captkaos]

All Automatic transmissions of the same type are geared the same the only thing that changes from car to car is the final drive ration.

If you go get ANY 6L80E the ratio listed IS the ratio of all of them, period.  You can't change it and they are selected by the manufacturer to be the best optimium ratio for the target application.

Same thing goes for any factory manual or automatic transmission ration.  You get what you get and that is it.

[Skunksmash]

Well the T-56 tremec had different ratios for different cars. Some got a .63 6th gear, some got a .50.

[fitz]

All Automatic transmissions of the same type are geared the same the only thing that changes from car to car is the final drive ration.

Well the T-56 tremec had different ratios for different cars. Some got a .63 6th gear, some got a .50.

The Tremec T-56 is a standard trans.