Same here, in a TF-1500. And the XPEG sounds as though it is thrashing
along at 5500 when I attempt to stay out of the way of the semis. -Curtis
On Sun, 22 Aug 1999 JVK52TD@aol.com wrote:
> Greetings All,
>
> I have been following the thread on the changing of the "T" rear end. How
> fast are you driving with this change ?? I have had trouble with the engine
> not standing up to 65-70 mph speeds with the 4.3, even though it will go much
> faster than that !!! I am at 5000 when I am @ 65 & 5500 @ 70.. Do not know
> how accurate my tach is....
>
> John Kinney Danville IL
>
>
> In a message dated 8/9/99 6:38:28 PM Central Daylight Time,
> lpalmer@vanstar.com writes:
>
> << Bob,
>
> See my answers below:
>
> -----Original Message-----
> From: BobMGT@aol.com [mailto:BobMGT@aol.com]
> Sent: Monday, August 09, 1999 5:07 PM
> To: mg-t@autox.team.net
> Cc: mgs@autox.team.net
> Subject: Changing Rear End Ratio in a TD
>
>
> I've always shied away from highway driving in my TD. The engine just
> doesn't
> sound too happy at 4000rpm. I've finely decided to take the plunge and
> change
> the rear end ratio. My mechanic has an MGA parts car, and is ready to sell
> me
> any parts I need from the rear end. Are the ring and pinion gears the only
> two parts I'll need from the MGA?
>
> No. If you choose to use MGA ring and pinion, you'll also need the driving
> flange, the pinion distance tube and spacer. Bearings for at least the
> pinion will also be required. But it's better to buy those new. Optionally,
> as long as you are in there, you'll probably want to replace the carrier
> bearings if they aren't brand new. (By the way, I have a full set of
> bearings for sale, if you need them.)
> ==================================
> Also, what is the recommended ratio for highway driving? Here are the
> options
> I've found:
>
> Standard TD 5.125 3900rpm @ 55mph (What I have now)
> TD option 4.875 3700rpm @ 55mph
> TD option 4.555 3470rpm @ 55mph (Gears available from Moss)
> MGA 4.3 3300rpm @ 55mph
> MGA 4.1 3120rpm @ 55mph
>
> It depends upon the type of driving you do. If all you do is freeway driving
> across nice flat states, the 4.3 is good. If, like me, you do a bit more
> hills, I find the 4.55 ideal. Don't consider anything lower ratio than 4.3.
> Since the TD transmission gearing is different than an MGA, don't expect
> that you'll get the same RPM/Speed combinations as the MGA. I find that with
> a 4.55 rear end, I do just about 60 MPH at 4000 RPM. I can also happily do
> 65 MPH, at about 4250 - 4300 RPM. All this with a slight reduction in hill
> climbing ability. I know find, with a 4.55 ratio, that hills I used to take
> in 4th gear, now require 3rd.
> =========================
> My mechanic claims the MGA parts car has a ratio of 4.5, but I only see 4.3
> and 4.1 in the literature. Is he mistaken?
>
> No, a 4.55 ratio was available. I know, because I'm running one in the TD.
>
> Carl Cedarstrand wrote a very good booklet on the subject of rear end
> conversions some years ago. It is still available from Moss Motors. I highly
> recommend you get a copy and read up on the theory and practice. I used it
> as the basis of a workshop I conducted for our local club last winter. We
> did 6 conversions in one day. To a person, everyone is very happy with the
> 4.55 ratio.
>
> Regards,
> Lew Palmer
> Bob Donahue (Still stuck in the '50s)
> EMAIL - BOBMGT@AOL.COM
> 52 MGTD - under DIY restoration NEMGTR #11470
> 71 MGB - AMGBA #96-12029, NAMGBR #7-3336
>
> >>
>
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