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1. [Fot] Rear End Ratios (score: 1): Author: "john hasty" <jhhasty@gdhs.com>; Date: Mon, 1 Jul 2013 12:57:02 -0400; The overall ratio we have in the TR3A is 3.7 achieved with a 4.1 rear end and overdrive. At VIR, Road Atlanta, Savanna and Mid Ohio, all with long straights, we are turning 6200 at the end of each of; /html/fot/2013-07/msg00011.html (10,483 bytes)
2. Re: [Fot] Rear End Ratios (score: 1): Author: Larry Young <cartravel@pobox.com>; Date: Mon, 01 Jul 2013 15:00:46 -0500; John, A 4:1 rear with overdrive (0..82) is 3.28. Unless you've changed it since I had it, it has a 4.55 rear, which gives 3.73 in overdrive. This is close to the standard top gear of 3.7 which most r; /html/fot/2013-07/msg00012.html (10,054 bytes)
3. Re: [Fot] Rear End Ratios (score: 1): Author: Larry Young <cartravel@pobox.com>; Date: Mon, 01 Jul 2013 19:24:02 -0500; I would also consider using the OD in in other than top gear. Quick shifting overdrive is sometimes more convenient in a tight and busy situation. It can also give you better gearing by splitting gea; /html/fot/2013-07/msg00013.html (12,903 bytes)
4. Re: [Fot] Rear End Ratios (score: 1): Author: John Hasty <jhhasty@gdhs.com>; Date: Mon, 1 Jul 2013 21:41:45 -0400; OK you guys. Thanks. What you are telling me is to get off my ass & drive the car! But it is really hard @ 77 to learn too many new tricks. I've only been at this 4 wheel stuff for 2 seasons but can; /html/fot/2013-07/msg00014.html (13,579 bytes)
5. Re: [Fot] Rear End Ratios (score: 1): Author: Tony Drews <tony@tonydrews.com>; Date: Mon, 01 Jul 2013 21:51:15 -0500; I only run a couple hundred RPM higher at the end of the straights at RA than at VIR or Atlanta. With a 4.1 and OD and 60 series tires, I'm at 5300 to 5500 coming into turn 5 and if I take the kink r; /html/fot/2013-07/msg00016.html (12,361 bytes)
6. Re: [Fot] Rear End Ratios (score: 1): Author: TR4 Tony <tr4.tony@virgin.net>; Date: Tue, 2 Jul 2013 08:55:19 +0100; Another option may be to run a different overdrive ratio, depending on the type of unit you have. I'm running an A type with a 28percent reduction and I believe that Chris Marx is running a j type wh; /html/fot/2013-07/msg00018.html (14,076 bytes)
7. Re: [Fot] Rear End Ratios (score: 1): Author: "Richard Taylor" <tarch@bellsouth.net>; Date: Tue, 2 Jul 2013 08:37:31 -0400; In the novelty division, in 4th gear, my TR-4 with the 3.7 rear end in overdrive, checks out at 72.6 mph @ 3000 rpms. Needless to say, I've never run out of rpms on a straight....anywhere. Richard Ta; /html/fot/2013-07/msg00019.html (15,601 bytes)
8. Re: [Fot] Rear End Ratios (score: 1): Author: EDWARD BARNARD <edwardbarnard@prodigy.net>; Date: Tue, 2 Jul 2013 06:29:16 -0700 (PDT); A long time ago I did the same 28% ratio. I believe it is from an A/H 100-4 or 100-6. I bought it from John Esposito. Found it quite strange because the O/D ratio was actually higher then the next ge; /html/fot/2013-07/msg00020.html (16,759 bytes)
9. Re: [Fot] Rear End Ratios (score: 1): Author: Larry Young <cartravel@pobox.com>; Date: Tue, 02 Jul 2013 14:45:28 -0500; This is a very easy change, once you get the overdrive out of the car. Just change the sun and planet gears. I believe the big Healeys used the higher ratio. I personally think the closer stock Trium; /html/fot/2013-07/msg00026.html (16,454 bytes)
10. Re: [Fot] Rear End Ratios (score: 1): Author: Larry Young <cartravel@pobox.com>; Date: Tue, 02 Jul 2013 15:01:08 -0500; That was with a close ratio gear set that has a high 1st gear and Hallett had one turn that is called "Stop and turn left". Yeah, I did my first autocross in years in Waco last month with the street; /html/fot/2013-07/msg00027.html (10,980 bytes)
11. Re: [Fot] Rear End Ratios (score: 1): Author: EDWARD BARNARD <edwardbarnard@prodigy.net>; Date: Tue, 2 Jul 2013 18:29:15 -0700 (PDT); Larry: I did the wiring through the reverse switch on Ray Josey's SpitSix. I didn't have the special bracket used on GT6 trannies for the O/D switches so I used the reverse as a disabler instead of t; /html/fot/2013-07/msg00029.html (13,315 bytes)
12. Re: [Fot] Rear End Ratios (score: 1): Author: TR4 Tony <tr4.tony@virgin.net>; Date: Wed, 3 Jul 2013 10:10:50 +0100; Hi again fellas You need to be aware that using overdrive in 1st gear with an a type unit will give it a very short life. Apart from the fact that you will cane the hell out of the bearings as you lo; /html/fot/2013-07/msg00031.html (14,235 bytes)
13. Re: [Fot] Rear End Ratios (score: 1): Author: Larry Young <cartravel@pobox.com>; Date: Wed, 03 Jul 2013 17:47:07 -0500; I did not follow your logic concerning the overdrive bearings. Are you referring the the two rear bearings that support the annulus and turn at drive shaft speed? They will be turning slower when ove; /html/fot/2013-07/msg00036.html (15,938 bytes)
14. Re: [Fot] Rear End Ratios (score: 1): Author: Larry Young <cartravel@pobox.com>; Date: Wed, 03 Jul 2013 18:05:57 -0500; Ed, Your wiring sounds similar to what I used. I used a commodity SPDT Bosch relay with the overdrive solenoid connected to the normally closed contact. The switches were wired in parallel so that th; /html/fot/2013-07/msg00037.html (10,994 bytes)
15. Re: [Fot] Rear End Ratios (score: 1): Author: EDWARD BARNARD <edwardbarnard@prodigy.net>; Date: Wed, 3 Jul 2013 20:34:52 -0700 (PDT); Yes, that is exactly how I did Ray's O/D. I like to use the term enabler or disabler because it makes it easier for people to understand how the switches are actually working. The five terminal gener; /html/fot/2013-07/msg00038.html (12,509 bytes)
16. Re: [Fot] Rear End Ratios (score: 1): Author: Tony Drews <tony@tonydrews.com>; Date: Wed, 03 Jul 2013 23:37:20 -0500; I'm interested in which bearing(s) this refers to. I've been beating the heck out of an A-type for 10 years now. I did manage to frag the one way clutch arrangement by loading the driveline with rear; /html/fot/2013-07/msg00039.html (15,049 bytes)
17. Re: [Fot] Rear End Ratios (score: 1): Author: TR4 Tony <tr4.tony@virgin.net>; Date: Thu, 4 Jul 2013 10:19:12 +0100; Hi both This issue relates to the bearing in the epicyclic gear (around which the three planet gears spin) - which therefore runs at three times engine speed. The mainshaft bearings are not such a pr; /html/fot/2013-07/msg00040.html (15,802 bytes)
18. Re: [Fot] Rear End Ratios (score: 1): Author: "Randall" <TR3driver@ca.rr.com>; Date: Thu, 4 Jul 2013 17:00:54 -0700; Nope. Since the entire overdrive is driven from the output shaft of the main gearbox, it's speed is relative to that. Meaning it all turns some 3 times slower in 1st gear than in 4th (for a given en; /html/fot/2013-07/msg00041.html (9,479 bytes)
19. Re: [Fot] Rear End Ratios (score: 1): Author: Ted Schumacher <tedtsimx@bright.net>; Date: Fri, 05 Jul 2013 08:53:36 -0400; A "rule of thumb" for gearing is you should be at peak revs in top gear 2/3 of the way down the longest straight. Thsi allows you to carry top speed for a longer period of time. Ted -- Ted Schumacher; /html/fot/2013-07/msg00042.html (15,244 bytes)
20. Re: [Fot] Rear End Ratios (score: 1): Author: Jim Norlin <norlinengineering@comcast.net>; Date: Wed, 10 Jul 2013 10:50:21 -0700; Finally catching up on old e-mails. This may not be totally relevant to the TR3, but I'll toss it out for the group. We normally run a 4.11 in our Spitfire and it works great at Portland without the; /html/fot/2013-07/msg00096.html (12,881 bytes)

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