crown and pinion
Discussion
Similar yes, but I'm slightly concerned why you want to know. The Triumph small car diffs aren't exactly home mechanic friendly, with several specialist tools required to break them down/rebuild them (S101, S101-1, S4221A, S4221A-8C, S4221A-17, S337 or RG421, 18G, 134, 18G134DH, 18G191, 18G191M to be precise!).
If it's badgered, then a second hand unit will set you back around £20 (but could be worse than the one you have). Recon units are around £300 (with a new crown wheel/pinion - cheaper ones tend to just have good, old ones).
If you want to reduce the weight of your TVR (!) then Canley sell cast and CNC machines alloy rear diff casings (saves 3KG over cast iron origonal, increases oil capacity and can be connected to an oil cooler). Fronts are still under development I believe.
If it's badgered, then a second hand unit will set you back around £20 (but could be worse than the one you have). Recon units are around £300 (with a new crown wheel/pinion - cheaper ones tend to just have good, old ones).
If you want to reduce the weight of your TVR (!) then Canley sell cast and CNC machines alloy rear diff casings (saves 3KG over cast iron origonal, increases oil capacity and can be connected to an oil cooler). Fronts are still under development I believe.
Hi, thanks for your response, in fact I have found a 4,55/1 crown and pinion from a spit, herald and I have a quaife 5 speed gearbox with a very long first( not installed but I try to fit rapidly) or if it is difficult to change without the good tools do you know where I can find a complete and rebuilt diff with high ratio.
I'd recommend giving Canley Classics a call.
If you want to get a second hand one, then there are a couple of Triumph breakers to try, Quiller Triumph and Spitbitz (a google will find their web sites - be warned they both have reputations for being dodgy as hell). 4.875:1 diffs were fitted to Herald 948's, 4.55:1 to 948TC's and 4.11:1 to most other Heralds/early Spitfire's. At the other end 1500 Spitfire's got 3.63:1 units.
If you want to get a second hand one, then there are a couple of Triumph breakers to try, Quiller Triumph and Spitbitz (a google will find their web sites - be warned they both have reputations for being dodgy as hell). 4.875:1 diffs were fitted to Herald 948's, 4.55:1 to 948TC's and 4.11:1 to most other Heralds/early Spitfire's. At the other end 1500 Spitfire's got 3.63:1 units.
I'd be worried about putting a Spitfire diff, or any Spitfire transmission parts for that matter, on anything with a bit of power, the entire drivetrain of my (then fairly new) Spitfire fell apart bit by bit with just the standard 1500 triumph engine powering it - prepare yourself for plenty of rebuilds!
I think all the low ratio cwp were for the early fragile diffs? i imported (for my then GT6 powered spit) a later 4.11 cwp from the states where they were used in the later spits in an effort to get acceleration back on the underpowered smog-test engines. I'm not sure but I was led to believe you couldn't fit anyting else low ratio into a diff that would take the power .. ie the later diffs are the strongest but the USA 4.11 was the lowest cwp that would fit .. ??
The 4.11 ratio fitted to a 1972 Spitfire IVs in the US were also fitted to Marina 1300s, Toledo and Dolomite 1300s.
There is a 4.55 which is as strong as other Spitfire ratios that will fit into a TVR diff, it comes from a marina van - the only people like to have any left are Canley Classics.
There is a 4.55 which is as strong as other Spitfire ratios that will fit into a TVR diff, it comes from a marina van - the only people like to have any left are Canley Classics.
Gassing Station | Triumph | Top of Page | What's New | My Stuff