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Vigilante Toyo Tech
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Discussion Starter #1
I;ve heard this fact:


These diffs (whole pumpkin) are the same
NA 5spd
NA Auto
TT Auto (Just the pumpkin but not the LSD)


Now question about the 2 NA ones

Is the NA 5spd diff geared the same as the NA Auto?

Geared the same as the TT auto?






-Brad
 

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Vigilante Toyo Tech
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Discussion Starter #3
What are the gear ratios for each?

Thats the pinion that changes the gear ratio, right?
 

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Vigilante Toyo Tech
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Discussion Starter #4
couldnt find it on google or on mkiv.com

-brad
 

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Scotch Scotch Scotch
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3,483 Posts
no, all different gear ratio.
Please elaborate if possible. Ive heard otherwise and i am very soon going to be doing my auto to 5 speed swap and i have both differentials so i need to know is its mandatory that i use the 5 speed diff or if the auto is ok
 

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Banned
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You can use either N/A differential; both have around a 4:1 gear ratio but there are differences between a 93-96 and 97-98. The 97-98 have a four bolt pattern for the rear differential to the drive shaft and to the trans.

The N/A differentials are superior to the TT due to the gear ratios being in the perfect range. Not too long and not too short.

I have an 98 N/A differential attached to my GTE motor and that thing rocks every single TT I have raced off the line all the way to 160 mph.
 

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Senior Member
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not confirmed but this is what I know...

auto tt- 3.67 gears
my old NA 5 speed diff- 4.27 gears
most NA autos- 4.08 gears

Note: This may not apply to all diff's, but I've done my research here on the forums and thats what I got.

However, the pumpkins externally are the same. They all bolt up to the mk4. In addition, Curt claims that the NA 5 speed cannot have a trd lsd, because it wont fit. Why? Are they different internally?
 

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BoostAddict4Life
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there is a difference in the auto to 5 speed differentials. i broke my stock 97 5speed diff a little while ago and swapped it out for a 95 auto large axle bolt differential. i was doing pulls in 4th to 122 then with the new diff change to 148
 

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Exiled Supra Owner
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The 1993 - 1995 NA's had a rear end differential gearing of 4.27. The 1996 - 1998 NA's had a rear end differential of 4.08 (I think 1996 was the year they had the 4.08).

There are 2 types of TRD LSD, one for the 6-Speed TT differential and one for the Auto TT, NA Auto, and NA 5-Speed (all 3 of those differentials used the same LSD). I have a TRD LSD for my NA differential (and it was purchased from Curt).
 

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Vigilante Toyo Tech
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462 Posts
Discussion Starter #10
The 1993 - 1995 NA's had a rear end differential gearing of 4.27. The 1996 - 1998 NA's had a rear end differential of 4.08 (I think 1996 was the year they had the 4.08).

There are 2 types of TRD LSD, one for the 6-Speed TT differential and one for the Auto TT, NA Auto, and NA 5-Speed (all 3 of those differentials used the same LSD). I have a TRD LSD for my NA differential (and it was purchased from Curt).
OK

SO 5spd and Auto are both (93-95) ARE 4.08?
 

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Vigilante Toyo Tech
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Discussion Starter #12

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EZ2CYI1
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Do the SC300's have the 4.27's too? I've heard that, and that they had lower gears as well (4.08 or 4.01), never gotten a definite answer.
 

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Vigilante Toyo Tech
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Discussion Starter #14
I'm not sure we'll ever know, every time i ask someone no ones really sure....

...everyone else says something different.

Is this written down somewhere on some spec sheet of sorts?

-b to the r to the AD

(I am dylexic, it looks like i spelled "BROTHER" just above)
 

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Exiled Supra Owner
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So both are 4.27?



an auto TT is a 3.67 gearing?


The pinion determines the gearing not the LSD correct?

-brad
NA 1993 - 1995 = 4.27 for both MT/AT. NA 1996 - 1998 = 4.08 for both MT/AT.

The Auto TT is 3.73.

The ring and pinon gear determines the gearing. The TRD LSD does NOT determine the gearing. A 4.27 should have a 47 teeth ring gear and 11 teeth pinion. A 4.08 will have a 49 teeth ring gear and 12 teeth pinion.

I believe the SC300's had the 4.08 differential.
 

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NA 1993 - 1995 = 4.27 for both MT/AT. NA 1996 - 1998 = 4.08 for both MT/AT.

The Auto TT is 3.73.

The ring and pinon gear determines the gearing. The TRD LSD does NOT determine the gearing. A 4.27 should have a 47 teeth ring gear and 11 teeth pinion. A 4.08 will have a 49 teeth ring gear and 12 teeth pinion.

I believe the SC300's had the 4.08 differential.
Good info, thanks!
 
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