TRExp

Spitfire & GT6 Forum

HOW TO ID A DIFFERENTIAL??

Moss Motors
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor

Dougmart Douglas Martinez
Holly Springs, NC, USA   USA
Folks
I have a spare diff that I got as part of a sale when I purchased my 72 GT6. How can I tell what ratio this diff is? Any tips or info greatly appreciated.

Thanks!

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
Pats54 Avatar
Pats54 Gold Member Mark M
Maynard, Mass, USA   USA
1979 Triumph Spitfire 1500
2012 Volvo C70 "The Weekender"
This chart will help you out by counting the teeth


Attachments:
IMG_2270.PNG    61.8 KB
IMG_2270.PNG

spitfire50 Avatar
spitfire50 Paul Mugford
Rochester, N.H., USA   USA
Doug,
Hold one output shaft still and turn the other. Count the turns of the input shaft for two turns of the output. The count is the ratio. Just over 4 =4.11, just under 4 =3.89, just over 3 1/2= 3.63, 3 1/4=3.27.
All the best,
Paul

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
mkivmarty Avatar
mkivmarty Marty Yanik
N.E.Ohio, USA   USA
Check the serial number stamped on the case. The three most common (If I remember right) are

FCxxxx 4.11-1
FDxxxx or FMxxxx 3.89-1
KDxxxx 3.27-1

Marty



Edited 1 time(s). Last edit at 2018-04-15 05:46 PM by mkivmarty.

trrdster Avatar
trrdster Wayne Tate
Spencer, NC, USA   USA
Paul, who will get the 10,000th post?
You work hard to keep us in line, thanks by the way.



Wayne
1970 TR6
2000 Jaguar XK8
1949 Triumph Roadster 2000
1978 Spitfire (rust victim)
1971 GT6 (tarp covered for 12 years, rusted inside out)
1980 Spitfire (getting all the good GT6 parts, all poly suspension and Spax shocks)



Edited 1 time(s). Last edit at 2018-04-15 06:21 PM by trrdster.

JohnW63 John Williamson
Apple Valley, CA, USA   USA
It's stamped on the bottom of the nose that extends toward the drive shaft ( Propshaft ).

Here is a link to a chart:
http://www.wolfitt.com/numbers_and_ratios.htm



Home of the 1969 GT6+ MK II resurrection project
and a sorry looking 1968 GT6+ parts car trying to stay whole.

spitfire50 Avatar
spitfire50 Paul Mugford
Rochester, N.H., USA   USA
In reply to # 1526536 by trrdster Paul, who will get the 10,000th post?
You work hard to keep us in line, thanks by the way.

I guess Brendan got it. I just posted to his lowering block thread again and that was it. I didn't know until I saw your post and looked at mine in this thread. So you get the beginning of my second ten thousandgrinning smiley
All the best,
Paul

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
Dougmart Douglas Martinez
Holly Springs, NC, USA   USA
Thank you ALL for your responses. What ratio will be best for a T9 5 speed conversion? I have the T9 already and seriously thinking about having it done.

Herald948 Avatar
Herald948 Andrew Mace
East Nassau, upstate NY, USA   USA
What's the 5th gear ratio in that T-9?



http://www.fairpoint.net/~herald948/database/

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
Dougmart Douglas Martinez
Holly Springs, NC, USA   USA
Yikes!
How do I determine what ratio 5th is on the T9?
Thanks!

carChips Avatar
carChips Victor Harnish
Kelowna, BC, Canada   CAN
1933 MG Magnette
1973 Triumph Spitfire 1500 "Chip"
1989 GMC Sierra 1500 "Bush Truck"
After converting to a T9, I've only seen two ratios, 0.82 and 0.79 and both are pretty close, so probably doesn't matter a whole lot.



'S all for now
Vic

. Hide banner ads & support this website by becoming a > Gold Supporting Member <

To add your reply, or post your own questions




Registration is FREE and takes less than a minute!


Having trouble posting or changing forum settings?
Read the Forum Help (FAQ) or contact the webmaster





Join The Club

Sign in to ask questions, share photos, and access all website features

Your Cars

1979 Triumph TR7 Drophead

Text Size

Larger Smaller
Reset Save

Sponsor Links