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5 Speed diff
Posted: 16 Apr 2008 10:00
by josa
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
Posted: 16 Apr 2008 11:35
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
Posted: 16 Apr 2008 11:40
by josa
paul many thanks for your help
josa
<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by paul w</i>
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
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
Posted: 16 Apr 2008 11:42
by lebochet9
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...
Posted: 16 Apr 2008 13:51
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.
Posted: 16 Apr 2008 15:12
by busheytrader
<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Odd</i>
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"></font 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.
Posted: 16 Apr 2008 16:58
by Steve @ SandS
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
Posted: 16 Apr 2008 21:24
by RJS
What does CWP stand for?
Rob
Posted: 16 Apr 2008 21:56
by paul w
Crown wheel and pinion!- the gubbins inside the diff........
See ya. Paul
Posted: 16 Apr 2008 22:16
by john 215
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
Posted: 16 Apr 2008 22:24
by KRenken
Crown wheel and pinion in the UK = Ring gear and pinion in the US
Kimmit
1980 DHC
GM 3.8 v6 fi
Posted: 17 Apr 2008 03:38
by Odd
<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" 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"></font id="quote"></blockquote id="quote">
I hope I'll never do that then - that's where the reverse is in my R380 gearbox... [:I]