Wanted 3.08 or 3.23 differential

[chris52]

Looking for a a BTR 3.08 or 3.23 diff if anyone has one kicking about they don’t need please let me know.
Chris

[phazed]

What is the standard fit ratio?

[chris52]

The standard is 3.45 looking for a better cruising ratio to keep the revs down a bit at 70. Was hoping to get a complete Diff but if I can’t get one I can get the crown and spindle to convert mine.

[anonymous-user]

The thing barely ticks over at 70 . (Griff 500). Not an engine known to rev. Curious , is it a 400 ?

[phazed]

Mine could easily pull another gear but I wouldn’t fit higher gearing as I wouldn’t want to upset the ratios at low speeds.

I would have to try a different diff first to see the difference before I commit.

From memory, you could buy a set of higher ratio years from a place in Australia and have them fitted to your existing differential over here. I believe he used to advertise on eBay.

[chris52]

The early cars with the GKN diff had a ratio of 3.31:1and a fifth gear ratio of 0.73 Mine is a late Griff 500 and has a diff ratio of 3.45:1 and a fifth gear ratio of 0.80 this gives cruise speeds of nearly 2800 rpm at 70mph I know about the crown and gear from Aussie and will go down this route if needed but was just hoping to get a complete diff then I have the option to get it reversed if I don’t like the way it drives.

[spitfire4v8]

I'd put 3.08 or even higher in my cars if I could afford to do it, one of the things i dislike about cruising in the tvrs is the ridiculously high revs at motorway speeds. My other halfs fiesta 1.2 is higher geared!

A change from 3.45 to 3.08 is only 10/11 percent, so if you're doing 2800 revs at 70 now you'll still be at 2500 with the higher ratio in.

If you drive a car with a 3.08 diff in you realise it just drives like a normal car .. you get no sensation of it being taller geared. No real dulled sensation of acceleration. Still able to trickle along in town traffic ok. It's win win win as far as I can see.