5 Speed diff

josa · Postby **josa** » 16 Apr 2008 10:00

Guys

Can someone tell me what is the standard diff ratio for a 5 speed TR7 diff and what should I get when I convert my car th V8.

thanks
in advance

josa

paul w · Postby **paul w** » 16 Apr 2008 11:35

Josa,the standard 5 speed diff ratio is 3.90:1
the recommended ratio for a v8 is 3.08:1 though some have used 3.45:1
for acceleration over top end.

See ya. Paul

josa · Postby **josa** » 16 Apr 2008 11:40

paul many thanks for your help

josa

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by paul w

Josa,the standard 5 speed diff ratio is 3.90:1
the recommended ratio for a v8 is 3.08:1 though some have used 3.45:1
for acceleration over top end.

See ya. Paul

lebochet9 · Postby **lebochet9** » 16 Apr 2008 11:42

If I remember 3.90 was for a TR7 manual and 3.45 was for an TR7 Auto. 3.08 was for a TR8 Manual and then there is 2.96 (Or something close) for a TR8 auto

There were some recent posts about this and the speedo pinion colours

1980 DHC TR7-V8 (was an 8V, then a Sprint)
Back on the road after 3 years restoring...

Odd · Postby **Odd** » 16 Apr 2008 13:51

2.84:1
But that was only fitted to the 1113 SD1 EFi VanDenPlas Automatics...
A truly great rear axle ratio to have in a highway commuter TR8, imho.

busheytrader · Postby **busheytrader** » 16 Apr 2008 15:12

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Odd

2.84:1
But that was only fitted to the 1113 SD1 EFi VanDenPlas Automatics...
A truly great rear axle ratio to have in a highway commuter TR8, imho.
<hr height="1" noshade id="quote"></blockquote id="quote">

Agreed 100%. I still find myself trying to grab the non-existant 6th gear on motorways. The V8 is so torquey it would easily cope with a lower ratio.

By comparison in our MX5 sport you have to change down from 6th to 5th or even to 4th to overtake comfortably on the motorway.

Cheers,

Adam

TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, Single Pipe Exh, 3.08 Rear, 200lb Spax & Solid Bushes, Anti- Dive, Granada Vented Discs & Calipers, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AllyCat 5 Spokes. No Door Stickers.

Steve @ SandS · Postby **Steve @ SandS** » 16 Apr 2008 16:58

Actually the diffs are the same in all 5 speed cars, it's the CWP that changes the ratio not the diff [:p][:D]

Steve @ S&S Preparations

RJS · Postby **RJS** » 16 Apr 2008 21:24

What does CWP stand for?

Rob

paul w · Postby **paul w** » 16 Apr 2008 21:56

Crown wheel and pinion!- the gubbins inside the diff........

See ya. Paul

john 215 · Postby **john 215** » 16 Apr 2008 22:16

Hi,
There was a 2.84:1 CWP on fleabay a month or so ago thought about a bid but then there is the problem of tracing down that elusive pinnion collaspble spacer [:(]
Cheers John

LIVE LIFE A QUARTER OF A MILE AT A TIME!
1979 3.5 FHC(STATUS PENDING!!)

1982 2.0 DHC NOW A 4.6 WILL BE ON THE ROAD VERY SOON!
Read My Blog http://www.waringstowntr7s.co.uk/blogs/ ... hp/John215

KRenken · Postby **KRenken** » 16 Apr 2008 22:24

Crown wheel and pinion in the UK = Ring gear and pinion in the US

Kimmit

1980 DHC
GM 3.8 v6 fi

Odd · Postby **Odd** » 17 Apr 2008 03:38

<blockquote id="quote">quote:<hr height="1" noshade id="quote"> I still find myself trying to grab the non-existant 6th gear on motorways. <hr height="1" noshade id="quote"></blockquote id="quote">
I hope I'll never do that then - that's where the reverse is in my R380 gearbox... [:I]

Anonymous

5 Speed diff

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