GSR auto vs LS Auto tranny

[TommyD1919]

I know there "should" be a difference in the gearing BUT does anyone know FOR SURE if the auto GSR transmission is different than a US automatic transmission? I have read tons of articles saying that the only difference is in the shift points programed in the ECU/TCM.. And then other articles saying they are different all together..

[Barefoot]

ive had to get this question answered before to friends in the field. never got a real clear yes, no, or documentation. so i would like to know also.

[Turbodude06]

I know someone who put a b16 auto in his teg and it was a hell of difference in gearing, idk about the gsr one though

[98blackcivic]

didnt even know gsr's came in auto

[TommyD1919]

only in japan land

[hurlyfire7]

good question.. lemme know when u find out!

[JKOBD]

I will look it up tomorrow at work and let you know.

[B3AST]

dude i looked for 4 hours and couldnt find anything on the gear ratios for a auto jdm gsr tranny! i learned so much about the s80/y80 manual trannys but nothing about the auto except the usdm ones. i hope someone can come up with something

[TommyD1919]

Yea its unreal that its so hard to answer this question.. I found a post saying that gsr, ls, b16 automatics are the same...

[Barefoot]

Yea its unreal that its so hard to answer this question.. I found a post saying that gsr, ls, b16 automatics are the same...
see thats what i was told but couldnt find proof anywhere.

[JKOBD]

Errr...tried to look them up today, but I need the part numbers for the mission. So back to the service manuals to get those numbers and then back to the research.

I know the USDM auto LS OBD1 mission is a 20021-P78-___, but still need to look up the others to confirm.

[Barefoot]

Errr...tried to look them up today, but I need the part numbers for the mission. So back to the service manuals to get those numbers and then back to the research.

I know the USDM auto LS OBD1 mission is a 20021-P78-___, but still need to look up the others to confirm.i got the usdm part number finding the jdm for is being a pain in the ass. i even emailed a few importers to see if they know by any chance. so far not a single reply.

[Barefoot]

jdm gsr is 37820-P72-901 still trying to confirm this.

[JKOBD]

jdm gsr is 37820-P72-901 still trying to confirm this.

Yeah, that is the part number for the ECU. I have a couple of those at my house as well as a couple B16 autos too. The problem is that I need the mission assembly part numbers. The auto LS part number for OBD2b is 20021-PGA-A10. I know the 20021 prefix is for automatic transmissions. Just as the 20011- prefix is for manual transmissions. 37820 is the prefix for ecus., etc.

So I searched through the 20021 prefixes and um yeah....there are over 2000 combos...lol. So I am going to continue searching for the middle number identifying the GSR/B16. I have confirmed the AUTO LS gear tooth count already.

[Barefoot]

Yeah, that is the part number for the ECU. I have a couple of those at my house as well as a couple B16 autos too. The problem is that I need the mission assembly part numbers. The auto LS part number for OBD2b is 20021-PGA-A10. I know the 20021 prefix is for automatic transmissions. Just as the 20011- prefix is for manual transmissions. 37820 is the prefix for ecus., etc.

So I searched through the 20021 prefixes and um yeah....there are over 2000 combos...lol. So I am going to continue searching for the middle number identifying the GSR/B16. I have confirmed the AUTO LS gear tooth count already.lol back to the drawing board for me.

[TommyD1919]

Somebody knows...

[Barefoot]

Somebody knows...im sure somebody does. it would be nice if they speak up. i cant find shit. ive been searching for a few days now and im about to give the hell up.

[JKOBD]

I didn't forget about this. In the process of moving. I have the drawings and part numbers and can confirm that there are in fact differences between the SI-V and SIRG models. I have confirmed though that there are many instances when the LS gearing is in the SIRG line up (same part nos). I am still working on it, but have tooth counts, etc. Many different configurations to go through and my Japanese sucks..lol

[hurlyfire7]

lemme get one of your auto p72 ecu's :ninja:

[DB4LYFE ™]

from what most forums say the GSR and LS is pretty much the same, it would be pointless to do. but i put a b16 in after my ls blew and it was alot stronger! but no worries anymore 5 speed tranny FTMFW!

~DB4LYFE

[TommyD1919]

ok thanks?

[bigdare23]

Just get a level 10 and call it a day. LOL

[TommyD1919]

I had problems with level 10 in the past with a 3rd gen RX7... Might go that route but really don't want 2..

[bigdare23]

I had problems with level 10 in the past with a 3rd gen RX7... Might go that route but really don't want 2..

JDMJAYDC2 has one in his intergra and it been going strong since the install.

[JDMJAYDC2]

ive had both and the auto gsr tranny really comes alive with a auto ecu some say its the same but i def felt the difference go figure. i have a custom ls ecu now with my level 10 so it shifts completely different depending on the throttle postion