SS Impala 4L60e in a Formula?

**BSonoma** · 10-04-2015, 10:51 AM

Good Morning all! I did a quick search and came up empty, so I wanted to throw this out there. I picked up a 4L60e out of a '94 Impala for my '94 Formula. Other then the obvious tail shaft housing difference, will this trans work in my bird? Any differences in the electronics, etc.?

Anyone have any first hand experience?

**BSonoma** · 10-04-2015, 11:47 AM

@Cahall

**CPT** · 10-04-2015, 01:19 PM

Originally Posted by BSonoma

Good Morning all! I did a quick search and came up empty, so I wanted to throw this out there. I picked up a 4L60e out of a '94 Impala for my '94 Formula. Other then the obvious tail shaft housing difference, will this trans work in my bird? Any differences in the electronics, etc.?

Anyone have any first hand experience?

The only difference is the tail housing.

Frank

**BSonoma** · 10-04-2015, 01:56 PM

@Cahall thanks!

Ok, good. Now that I know that for sure; I finished installing it last night (I didnt want to admit it until I knew for sure it should work) and road tested it this morning. I put it in drive and it will only start out in, I think, 3rd gear. If I manually down shift it into 1, it'll start out in 2 (I'm pretty sure it's 2nd). So, I only have 2 and 3 gears shifting manually. The TQ isnt locking up, at all. lastly, the speedo is WAY off. 15 to 20 mph off.

What did I do wrong? Did I miss plugging something in? I'm assuming the plug on the tail shaft housing is the speed sensor. That plugged in nice. The larger plug on the other side of the tranny felt like it plugged in. Could that be the issue? Could I have not pushed it firm enough?

**BSonoma** · 10-05-2015, 11:26 AM

Originally Posted by BSonoma

@Cahall thanks!

Ok, good. Now that I know that for sure; I finished installing it last night (I didnt want to admit it until I knew for sure it should work) and road tested it this morning. I put it in drive and it will only start out in, I think, 3rd gear. If I manually down shift it into 1, it'll start out in 2 (I'm pretty sure it's 2nd). So, I only have 2 and 3 gears shifting manually. The TQ isnt locking up, at all. lastly, the speedo is WAY off. 15 to 20 mph off.

What did I do wrong? Did I miss plugging something in? I'm assuming the plug on the tail shaft housing is the speed sensor. That plugged in nice. The larger plug on the other side of the tranny felt like it plugged in. Could that be the issue? Could I have not pushed it firm enough?

Bump

**MKCoconuts** · 10-06-2015, 12:24 PM

Did you swap the speedometer gears from your old one to the new one?

**CPT** · 10-06-2015, 12:55 PM

Originally Posted by BSonoma

@Cahall thanks!

Ok, good. Now that I know that for sure; I finished installing it last night (I didnt want to admit it until I knew for sure it should work) and road tested it this morning. I put it in drive and it will only start out in, I think, 3rd gear. If I manually down shift it into 1, it'll start out in 2 (I'm pretty sure it's 2nd). So, I only have 2 and 3 gears shifting manually. The TQ isnt locking up, at all. lastly, the speedo is WAY off. 15 to 20 mph off.

What did I do wrong? Did I miss plugging something in? I'm assuming the plug on the tail shaft housing is the speed sensor. That plugged in nice. The larger plug on the other side of the tranny felt like it plugged in. Could that be the issue? Could I have not pushed it firm enough?

3rd gear starts with 2nd only being abled manually is a sure sign of the trans being in "limp mode". Start by double checking all your connections. If everything is connected correctly, you will need to have it scanned. It will have a code for sure.

Frank

**BSonoma** · 10-07-2015, 03:50 PM

Thank you sir! @Cahall

**BSonoma** · 10-11-2015, 04:11 PM

Still perplexed... checked the harness, it's plugged in solid now and there has been some improvement and another step back. It will shift on its own in D, but still starts in second, even if I put it in 1. Also won't go into 4th. On the plus side it's shifting on its own, from 2 to 3, but it's overheating now too. I'm stumped. Anyone have any other advice?

**BSonoma** · 10-11-2015, 05:58 PM

Originally Posted by BSonoma:449042

Still perplexed... checked the harness, it's plugged in solid now and there has been some improvement and another step back. It will shift on its own in D, but still starts in second, even if I put it in 1. Also won't go into 4th. On the plus side it's shifting on its own, from 2 to 3, but it's overheating now too. I'm stumped. Anyone have any other advice?

Ok, taking part of that back. It shifts 2-3-4 good and by its self. Won't go into 1st on its own or manually. No TC lock-up and it's over heating. Pushing fluid out after running it, but not while it's running. As soon as I shut if off and it sits a minute, all of a sudden it starts dripping fluid. Still perplexed...