Paging Russ K or someone similiar 4t65hd swap- p1811 code

I thought I had my calculation correct, but I seem to be getting a p0730 with the eventual hard shift. Here's a copy of my original tunes. I'm going to switch the p0730 to "no error reported" in attempt to keep the trans from grenading itself.

This is a 2001 Lesabre which has a 4t65eHD swapped in from a 98 Regal GS. The trans shifted great in the Regal. The car also underwent a genv swap,northstar tb,lq9 maf, ported l32 heads, headers, 3" exhaust, custom CAI with the hd trans, so it got a lot of changes at once.



stockzues2- The Lesabre original tune

97duecestock- the transmission donor vehicle

According to the Hollander interchange, only a 2001 transmission from a 3800 K engine will work.

Russ Kemp

Here is the actual calibration I'm using.

Your interchange program is correct, most likely due to my Lesabre having an internal mode switch and the Regal had an external. I swapped it over though. :cool:

Alright here's my update. The p0730 still comes back with my latest calibration. I'm probably missing something simple. Let me know what you think.:banghead:

The speedo is currently 2 mph off, so I have to be close lol

The Lesabre had a 2.86 final and the new trans is 3.29 which puts my calculation to a 3.78465= 3.78. Should I try 3.79? Maybe this new trans really isn't a 3.29 FD.... :/

Starting with your stock Lesabre tune, change the gear ratio to 2.93. Leave the sprocket ratio stock at 1.00.

Russ Kemp

That did it! Car shifts great and no code! I don't know what the 3800 group would do without you Russ! I see the sprocket ratio messed up my calculation!

How the hell did you come up with a 2.93 there Russ? Have to ask man...

Because the SC3800's had a 2.93 final drive ratio (3.29/1.121=2.93). But changing the sprocket ratio in the editor has caused a lot of P0730 DTC's plus hard shifts. In this case he changed the sprocket ratio to 1.121 from the stock 1.00 in the Lesabre tune.

Russ Kemp

Thanks there Mr K, I was messing with calcs and could not for the life of me figure out what you had done to come up with that. I guess this would apply to the GP's as well. Thanks for the tid-bit man... as always, you rock bro!

I have a slight update to this gear ratio issue. I finally got to see the top of 2nd gear in the car and it seemed to hit that weird limiter as if the gear ratio was off. 1-2 shifts great wot. 2-3rd is where it happens. There is no gear ratio code, but maybe its not off enough to set it?