What trans to select for resale

[WayneE]

I think you've got it, Tony.

Next up, higher stall speeds!

[barraza]

One more question: Why a heavy 6 speed with an extra gear you never use anyway? Why not a TKO 600 five speed with only one overdrive?
I cant understand all the hype about a T56? Who need that big suker under there and why do you need two overdrives>?

I am curious?

Most people don't investigate enough and use a take out tranny behind an early motor which is a mistake. It's true that most carbed engines with healthy cams don't need a .5 sixth gear, but the aftermarket T56 has better ratios(.62 instead of .5 sixth). It also plugs into a standard bellhousing, uses a standard clutch, and also a standard speedo drive. It will be cheaper unless you get a tranny for nearly free. Mine was less than $2k, brand new and fell right in where a T10 was.

[Steve Chryssos]

No. Everyone is right. Manual transmissions off less parasitic loss and direct drive coupling--100% coupling efficiency between the engine and transmission. Manual transmissions do not offer torque multiplication.

Automatic transmissions, inversely have more parasitic loss and some slippage when not locked up.

Confusion is is largely the result of lumping coupling efficiency (slippage) with driveline efficiency (parasitic loss). Adding to that confusion is the fact that slippage is both a good thing and a bad thing--not just a negative. It's what makes automatics easier to drive in traffic. It also saves hard parts when drag racing and eliminates the need to interrupt power transfer during gear changes. It can therefore be argued that the automatic's higher parasitic losses can be written off when compared to the between-gear power interrupt and lack of torque multiplication of a manual transmission.

[TonyHuntimer]

No. Everyone is right. Manual transmissions off less parasitic loss and direct drive coupling--100% coupling efficiency between the engine and transmission. Manual transmissions do not offer torque multiplication.

Automatic transmissions, inversely have more parasitic loss and some slippage when not locked up.

Confusion is is largely the result of lumping coupling efficiency (slippage) with driveline efficiency (parasitic loss). Adding to that confusion is the fact that slippage is both a good thing and a bad thing--not just a negative. It's what makes automatics easier to drive in traffic. It also saves hard parts when drag racing and eliminates the need to interrupt power transfer during gear changes. It can therefore be argued that the automatic's higher parasitic losses can be written off when compared to the between-gear power interrupt and lack of torque multiplication of a manual transmission.

Thanks for the "informed" answers.

Tony Huntimer
RaceHome.com

[rocketman]

The TKO-600 is a better choice for a lot of people. It is stronger, lighter, has more shifter options, more speedometer options, and can be had with a track-useful .82 OD 5th gear. It's also a good choice for a car with a high hp engine that isn't very happy cruising at 1500-2000 rpm.

jp

T-56 only, I have to many problems with TKO's I would only go 6-spd

[rocketman]

I agree. For resale auto may be better, but for god's sake, teach her to drive a stick!
Mark

I taught mine to drive a Lenco on the street(not real well but she could for those night I drank to much at show's or cruise nights)

[rocketman]

But a auto is almost a sure bet to sell, a 700r4 or something like it

[johnny rockett]

The trans choice is not always about power. Its about preference and how it will be driven? How it will be driven is a matter of choice for the new buyer......so are there more automatic buyers or stick buyers? To me that is what it comes down to?

I raced A serious NHRA class for 30 years.......always raced a stick. The latter years it was a clutchless piece.

I was asked by a company to back to back an automatic 3 speed ( Pro Flight) a six thousand dollar torque flight now currently used by almost every serious Comp Eliminator guy in the country against my clutchless 5 speed.......NHRA wanted to know if the Automatic was faster or how much weight you had to take out to make them equal the ET. I was the record holder at the time so they chose me and it had to be done within hours.......same track same day......We did it with about 4 guys and changed it out pretty fast and was given the right torque convertor for my engine ( A1)

The results were: We had to remove 250 pounds out of the car to match the 5 speed times with the auto.......These were the best of the best of both worlds.

You can interpulate from the above to decide what is what.....A clutchess trans is worth about a .10 to .15 in Elapsed time over the standard trans. Ronnie Sox maybe not that much.

By the way when you get in the 3000 pound area....100 pounds out a car is worth a tenth of a secind in ET

So given the same weight if you can shift........the stick will be about a tenth faster than the auto....

Thought you might be interested in that info.........it all holds true today because of that test the automatics are given a 250 pound weight reduction in class racing that affects them.....usually they are giving them a larger engine since they have to weigh per cubic inch and most cars cannot get out the 250 pounds.