KA vs. SR transmission??

[SR20S13]

so my 4th gear is going out in my car and i have the old ka trans at my house...i know i can swap the bellhouseing but i kinda wanna build it but idk which one to do b/c i know the gearing is different...

whats everyone think/have??

[SlideWayzS13]

Same exact trans.....just swap bellhousings and ur set.....if you drift or race ur car dont spend money on a built trans unless u have the extra cash to waste. Cause ur just gonna break it again

[240_SeX]

the only difference is that 5th gear is slightly longer, its almost not noticable. you just tach a little lower in the highwaylower RPM= better MPG

[boro drift]

I'm positive that even the 5th gear is the same. I had a KA and a SR transmission disassembled and I counted every tooth on every gear, gearing between the two are identical. Is your transmission making noise in 4th or grinding going into 4th?

[240_SeX]

KA24DE 1st- 3.3212nd- 1.9023rd- 1.3084th- 1.0005th- 0.759

SR20DET5spd--1st: 3.3212nd: 1.9023rd: 1.3084th: 1.0005th: 0.838Reverse: 3.382Final Drive: 4.083

[jr_ss]

240_SeX- Where did you get your information from? Every single spec I pull up it's exactly the same...

[Tulsa_S-13]

The S13 SR and ALL KA transmissions are the same, 240_SeX is pulling his from the S14 SR20DET factory shop manual which indicates that the S14 SR has different gearing.

[240_SeX]

a slight improvement. The change isn't that dramatic, though.

The SR uses an .838:1 gear ratio and the KA uses a .759:1 gear ratio

So if I'm actually able to keep this straight, which I have difficulty with gear ratios I might add, the KA's gear will allow the engine to turn slower given the same road speed.

Found here zerothread?id=278158

I also found the same specs in various google searches.

[boro drift]

Found here zerothread?id=278158

I also found the same specs in various google searches.

Ok,ok, I believe you! Obviously I didn't have these 2 trannys disassembled and I don't know how to count.

[240_SeX]

Listen a$$, im just showing what i found. I have done the KA bellhousing swap on my SR and it tachs lower in 5th, can you explain that if its the same gear ratio??

[boro drift]

I'm not gonna argue anymore about it with you, so I'll leave you with this.

If you get a chance in the future to personally view each disassembled trans,(s13 ka and a s13 sr), count the teeth on each gear.

[slow s13]

the ka input shaft is slightly smaller after the splines it necks down where the sr input shaft does not do this and is a thicker