Difference in trans between 90 & 93????

[alnukem]

Hi, I have a had a 90 for 4 years & very recently bought a 93. The difference in the trannys is incredible, the 90, although the 1st gear syncros are shot, feels so much better/solid.....could this be true? I realize that the 90 has a short shifter & the 93 feels more like a grocery getter, there has to be more to it than the shifter. Thanks!

[Kevin]

They changed from the black tag "rock crusher" to the quieter but weaker blue tag in 93

[XfireZ51]

Short throw has a more mechanical, positive feel to it. Just more precise.

[ZZZZZR1]

1990 to 1993 are idential.

1994/1995 are quieter and supposetly can handle less HP.

I bet your 1993 transmission is "built" (ballanced and blueprinted) or maybe cryo'd?

:cheers:

David

[WVZR-1]

1990 to 1993 are idential.

1994/1995 are quieter and supposetly can handle less HP.

I bet your 1993 transmission is "built" (ballanced and blueprinted) or maybe cryo'd?

:cheers:

David

'90 and a "portion" of the '93 production are the same. Only the information from the tag will confirm what the OP's transmission is. The later '93 production transmissions are by spec 540 Nm transmissions.

OP - If the last 3 digits on your tag in the '93 are 045 it would be a 610Nm transmission and if 047 the lighter spec 540Nm transmission.


They changed from the black tag "rock crusher" to the quieter but weaker blue tag in 93

The "rock crusher" reference is "worn out" - That applies only to the original M22 Muncie and it's been a long, long time but I don't exactly recall what I'd consider "similarities"! The "blue tag" isn't a '93 reference either - the lesser "torque rating" yes but the tag no and the characteristics NOT either. The later '93 was still a "black tag" and had a "lift-ring" for reverse access. Blue tags are "crash-thru" and only in '95 production.

[Kevin]

1990 to 1993 are idential.

1994/1995 are quieter and supposetly can handle less HP.

I bet your 1993 transmission is "built" (ballanced and blueprinted) or maybe cryo'd?

:cheers:

David

coulda sworn that was a 93 change. oh well been wrong before

[Kevin]

'90 and a "portion" of the '93 production are the same. Only the information from the tag will confirm what the OP's transmission is. The later '93 production transmissions are by spec 540 Nm transmissions.

OP - If the last 3 digits on your tag in the '93 are 045 it would be a 610Nm transmission and if 047 the lighter spec 540Nm transmission.




The "rock crusher" reference is "worn out" - That applies only to the original M22 Muncie and it's been a long, long time but I don't exactly recall what I'd consider "similarities"! The "blue tag" isn't a '93 reference either - the lesser "torque rating" yes but the tag no and the characteristics NOT either. The later '93 was still a "black tag" and had a "lift-ring" for reverse access. Blue tags are "crash-thru" and only in '95 production.
that's why I put it in " " it's the the same thing but it's "similar"

[alnukem]

1990 to 1993 are idential.

1994/1995 are quieter and supposetly can handle less HP.

I bet your 1993 transmission is "built" (ballanced and blueprinted) or maybe cryo'd?

:cheers:

David

Dave, the 90 is the "One Lap of America" car with the diff & trans coolers. I really don't think it was blueprinted, no mention in the documents I got with the car. I do have a dealership invoice that says "Clutch Exploded".

[alnukem]

'90 and a "portion" of the '93 production are the same. Only the information from the tag will confirm what the OP's transmission is. The later '93 production transmissions are by spec 540 Nm transmissions.

OP - If the last 3 digits on your tag in the '93 are 045 it would be a 610Nm transmission and if 047 the lighter spec 540Nm transmission.




The "rock crusher" reference is "worn out" - That applies only to the original M22 Muncie and it's been a long, long time but I don't exactly recall what I'd consider "similarities"! The "blue tag" isn't a '93 reference either - the lesser "torque rating" yes but the tag no and the characteristics NOT either. The later '93 was still a "black tag" and had a "lift-ring" for reverse access. Blue tags are "crash-thru" and only in '95 production.

I think mine is at the upper end of the production. Don't get me wrong, the 93 actually shifts easier than my clapped out 90 trans, but doesn't feel as "solid" or "good". Is there any difference in gear pitch?

[WVZR-1]

I think mine is at the upper end of the production. Don't get me wrong, the 93 actually shifts easier than my clapped out 90 trans, but doesn't feel as "solid" or "good". Is there any difference in gear pitch?

You need to check the build # on the transmission tag. Build # should be on all 1052-000-XXX. An XXX build of 045 would be identical to a '90 internally and a build of 047 would be the later lighter build. The difference in the helical cut and assembly is what reduced the torque rating of the two. I've never seen the counter gears for the two displayed side by side for a comparison of the difference in the helical cut. I would think that the images are out there - I've never looked.

From the ListServe is a good read:

http://maillist.corvettemuseum.com/cgi-bin/wa.exe?A2=ZR1NET;ITJL8A;20010206222041-0700