flywheel and rear end

[phatt]

I have two questions. Did the last of the series V's use the 3.89 rear end? Second, did all alpines use the same flywheel. I have a flywheel which will not bolt to my series V crank. What car did it come out of? I may want to list it on ebay. Thanks,Paul Hatter

 

[jumpinjan]

I'm pretty sure ALL seriesVs had a 4.22:1.
What I know about the flywheels:
Series I - two mounting pins for 8" clutch plate
Series II - three mouning pins for 8" clutch plate
Series 3 - " "
Series IV - " "
Series V - lighter; Uses 7.5" clutch
I think they should ALL bolt up to the crankshaft either 1600/1725 and have the same starter ring gear

 

[RootesRich]

I thought that all SV's without OD had a 3.89. If equipped with an OD, the rear end was a 4.22.

 

[jumpinjan]

Rich,
That's with the older Alpines, where if they OD, the rear axle was 4.22. Without OD, they came with 3.89.
I'm pretty sure ALL series V, had 4.22s

 

[volvoguys]

North American models from B94102641 to B39510312 all had 4-22:1 differentials.

Mark ..... volvoguys

 

[Alpine Addict]

I did not know that what happened after B39510312 ?

 

[RootesRooter]

3.89's were standard after B39510312. OD Series V's had 4.22's throughout.

I did not know that what happened after B39510312 ?

 

[SIVAllan]

This is interesting, with the main point being for sale in North America?

For example, Sunbeam Alpine and Tiger by Graham Robson (Crowood Press 1996/2003), an English publication, indicates that Series Alpines had standard 3.89 and optional 4.22/3.39 OD except for S3, which had 3.89 standard and 3.89/3.12 optional OD.

 

[puff4]

For some reason which I have never been able to understand, the later Series Alpines that were shipped to the USA with OD were supplied with a 4.22 rear while the home-market cars and those for Europe came with 3.89 rear. Pretty stupid, really, given that America is full of open roads and Europe and the UK are full of twisty ones.

 

[phatt]

The serial number that this rear end came from is B395018100.I am confused! What do I have? If I have a 4.22 I would possibly like to buy a 3.89.

 

[RootesRooter]

Per the very late Series V serial number, if your Alpine doesn't have "OD" listed on the VIN tag, then it should have 3.89's. However, yours wouldn't be the first to have blown up the original and have a replacement of different ratio.

You'll have to go thru the wheel spinning/counting exercise described in other threads to know with certainty which ratio you have - or take the diff out of the car and read the numbers on the crown wheel.

The serial number that this rear end came from is B395018100.I am confused! What do I have? If I have a 4.22 I would possibly like to buy a 3.89.

 

[Alpine Addict]

It it impossible to determine what is in the car by serial number as it could have been changed.

I believe there is a way to jack up the rear turn the wheel a certain number of times and see how many times the driveshaft turns. The ratio then can be calculated. Can someone confirm this?

 

[65beam]

rear end

the series 5 cars that came to the states had 4.22 gears in the rear regardless whether they had overdrive or not. if it's a series 5 rear axle and has not been changed out ,it's a 4.22 .

 

[todd reid]

I have been told the reason for the 4.22 rears in all Series V's was the Chrysler Marketing Dept. wanted a lower 0 to 60 time. Having lived through those times, it seems plausible.

The quick & dirty procedure for checking your rear. Jack up one rear wheel (and support safely). Put a mark on the drive shaft and the jacked up tire (chaulk, masking tape, etc). Put trans in neutral. Rotate the drive shaft exactly 2 rotations. If your tire has rotated slightly less than 1 full rotation, you have a 4.22 (2.11 rotations of the driveshaft should equal 1 rotation of the tire). If your tire has rotated slightly more than 1 full rotation, you have a 3.89.

The thing to remember is that with only one tire spinning, your results are 2times reality.

 

[RootesRooter]

Please! Don't confuse the lad after we got him on the right track.

The mid-Series V switch from 4.22's to 3.89's in U.S., non-OD cars is well documented. See: Light Range Manual, the factory Parts Manual or Sunbeam Specialties' catalog.

the series 5 cars that came to the states had 4.22 gears in the rear regardless whether they had overdrive or not. if it's a series 5 rear axle and has not been changed out ,it's a 4.22 .

 

[65beam]

rear end

if you look at the series 5 dealer literature, you'll find they show the 4.22 gears for both the early and late series 5 cars .

 

[RootesRacer]

Ive parted several fairly late SV axles and Ive never seen a 3.89 in any SV.

 

[husky drvr]

Isn't that mid series change referring to the change back to manual adjust brakes?

 

[MikeH]

I'm getting a bit confused here. I have 2 '66 series V's. One with a very low serial number. So did all series V's have 4.22's? I've been looking for one for my conversion. I haven't checked what mine is, I had just assumed it was a 3.89.

 

[RootesRich]

Mike, you're not the only one confused...

I took a look at what's posted under the technical data section on our website and according to the SAOCA (for SV's): Standard 3.89:1 rear end (4.22:1 with OD) LRX models had 4.22:1 standard on all models.