Deciding on a transmission

[Elwood blues]

So I'm currently working on my first build and I have an engine to put in the car but i am not familiar with transmissions and not sure what i should put behind it. I want to put a manual but its not mandatory as the car did not originally have one. I just looking for something that will not break and can be easily rebuilt to perform better. planning to put it in my 71 scamp with a 5.7 hemi, planning on going for a street/strip kinda thing but also want to be able to cruise decent. Looking for any and all suggestions, tips, knowledge.

 

[Peter Bates]

I installed a new silver sports four speed auto the a41. It gives me a hell of a launch and is getting 20mpg on the highway (I have a 392 in front of it). Yes try are costly but it's modern technology.

If money is tight find a 727 and have it rebuilt with some shifter kit and bolt her up. You'll not have an issue with it at all. The sister 904 tranny is weaker.

Installing a four speed or more make the mod more challenging since your not a four speed original car. Linkage, bell housing, tunnel work etc.

 

[Elwood blues]

My friend suggested a 727 as well since we couldn't find a 4 speed manual. Any suggestions on a good rebuild kit for them.

 

[Clelan]

I vote for the A-500/518 overdrive auto.

Cley

 

[Elwood blues]

Since those were mainly used in trucks would that be a bit big to fit under the car?

 

[toolmanmike]

Built right a 904 can handle a lot of abuse.

 

[Clelan]

A-500 fit great in my Duster. A-518 is a little bigger like a 727 but still very doable. Several threads on the subject here. Including mine.

Cley

 

[j par]

The new 5.7 hemi fits the older 727?

 

[j par]

My friend suggested a 727 as well since we couldn't find a 4 speed manual. Any suggestions on a good rebuild kit for them.

I was happy I got my rebuild kit from a local Parts distributor because when parts were miss packed I didn't have to send for them I can just go down and get them. About $120 or so.

 

[j par]

Since those were mainly used in trucks would that be a bit big to fit under the car?

Yes mostl trucks that had automatics we're 727 but all the big cars had them also. It will fit. Likely all you need is a 904.

 

[Clelan]

The new 5.7 hemi fits the older 727?

New Hemis use small block bolt pattern.

Cley

 

[Elwood blues]

The new 5.7 hemi fits the older 727?

Yes i have a 2005 5.7 hemi that i would pair with an earlier 727

 

[Tsully]

I installed a new silver sports four speed auto the a41. It gives me a hell of a launch and is getting 20mpg on the highway (I have a 392 in front of it). Yes try are costly but it's modern technology.

If money is tight find a 727 and have it rebuilt with some shifter kit and bolt her up. You'll not have an issue with it at all. The sister 904 tranny is weaker.

Installing a four speed or more make the mod more challenging since your not a four speed original car. Linkage, bell housing, tunnel work etc.

I just put mine in and finished wiring it up...trying to get some front end and engine work completed before I try it out! I’m looking forward to seeing how it runs...I bit the bullet and got the Stage 3 one so in the future I won’t have to upgrade the trans if I go up in motor!

 

[AJ/FormS]

So I'm currently working on my first build and I have an engine to put in the car but i am not familiar with transmissions and not sure what i should put behind it. I want to put a manual but its not mandatory as the car did not originally have one. I just looking for something that will not break and can be easily rebuilt to perform better. planning to put it in my 71 scamp with a 5.7 hemi, planning on going for a street/strip kinda thing but also want to be able to cruise decent. Looking for any and all suggestions, tips, knowledge.

With this much motor, and the lightweight scamp, and the skinny wheel wells,...... A) you don't need a manual trans, and B) any automatic will do, so C) Stuff a regular A 904 in there and a 2800, and 3.23s minimum and call it done. ...... unless your Hemi has a big cam and lousy cylinder pressure , then add more gear, to get you off the line .

 

[rumblefish360]

Raining on more parades.....