'Tall' 901 ... WOW !, ... what a difference Options

[propricer]

After almost 20 years of driving ( including burn-outs, etc. ), my 914-V8 ( 327 ) with a bone stock 901, finally gave out.

Have a 77 ( short ) 930 with LSD that had been set aside as a replacement but, after careful consideration, I decided to try a ‘tall’ 901 … flipped ‘H’ into 5th, old 5th into 4th and old 4th into 3rd.

WOW … I am SO impressed, I had to share ...

Still have the off-the-line pump using the same old 2nd ( since it's fixed on the shaft ) and the ratios going up are very smooth and then I get into 5th where the tach runs around 2600 - 2800 on the highway. Makes highway driving a pleasure again !

If you have a conversion, the next time you have to go into the box, try this ‘tall’ conversion – you will NOT regret it.

BTW … the old box, it turns out, didn’t really fail … I use a 911 pull type 225mm clutch and the bolt holding the clutch fork backed out. Bottom line is I’m still very, very strong on the trusty old 901 and will state that even more strongly in my book, the 914-V8 Conversion Reference Manual.

[propricer]

I'm assuming your application is a V8 ...

Since the ring & pinion in a G50 can NOT be flipped, the box must run inverted in a 914-8 which usually means that most of the floor in the rear trunk must be removed ... are you quite sure you want to do this ???

Further, the gearing of a G50 is not very well suited to V8 applications so you will have to regear the box which can be expensive.

If you're determined to move away from the 901, you might consider the 930 as a better comprimise - 4 speed vs 6 speed, however ( G50/50 only ! ).

H gear is 2nd gear out of a 902 ... has a 19:32. Flipping it means to reverse the gears on the shafts so you end up with a 32:19.

In terms of speeds in gears, etc. it depends on your redline, etc. so you should contact CarQuip and get their gear selector excel spreadsheet so you can see it for yourself.

Good luck ...

[Dinobx]

Hey Ed,

Actually. it's for a 3.6 porsche engine. Yeah, I thought that it might require some trunk modification.

Ah, that's what am H gear is. Thanks for the clarification.

I'm not totally against the 901, it's a nice shifting transmission, it's just that I'd like to change the gearing and eliminate that fragile first gear, yet retain the five gears. Four gears in the 901 might be a bit too spread out, causing big drops in rpm when shifting.

Dino

I'm assuming your application is a V8 ...

Since the ring & pinion in a G50 can NOT be flipped, the box must run inverted in a 914-8 which usually means that most of the floor in the rear trunk must be removed ... are you quite sure you want to do this ???

Further, the gearing of a G50 is not very well suited to V8 applications so you will have to regear the box which can be expensive.

If you're determined to move away from the 901, you might consider the 930 as a better comprimise - 4 speed vs 6 speed, however ( G50/50 only ! ).

H gear is 2nd gear out of a 902 ... has a 19:32. Flipping it means to reverse the gears on the shafts so you end up with a 32:19.

In terms of speeds in gears, etc. it depends on your redline, etc. so you should contact CarQuip and get their gear selector excel spreadsheet so you can see it for yourself.

Good luck ...