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Wedge List / Re: transmission weights
« Last post by Wayne Simpson on April 30, 2017, 06:04:21 PM »
I could have told you it was heavy.

Sent from my BlackBerry 10 smartphone.

  Original Message
Wedge List / transmission weights
« Last post by tencate on April 30, 2017, 03:45:50 PM »
I just did a search on this and came up empty so I thought Ibd add to

Oddbs posting from a while ago (2005) so it got archived in the wedgelist

archives for future searches:

JUST the LT77 gearbox, no shift extension, or bellhousing, or crossmember bits


86 pounds.

> Doug,

> a Leyland Transmissions LT77 [TR7/TR8-type] 5-sp gearbox

> complete with bellhousing, extension and rear crossmember

> weigh in at a staggering 51 kg [~112.5 lbs]...  If there

> isn't a rear crossmember and its components you can de-

> duct roughly 2.5 kg [~5.5 lbs] from the above figure.


> Best regards

> /Odd




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Wedge List / Re: CN VS CL transmission
« Last post by Darrell Walker on April 30, 2017, 10:25:16 AM »
Wedge List / CN VS CL transmission
« Last post by "peternuss" on April 29, 2017, 11:36:43 AM »
One other thing I have noticed (from what has already been mentioned) when

installing a CL trans into a TR8 is the locating dowels on the CL trans are

longer than the CN dowels.  I'd advise checking these before bolting the trans

onto the bell housing.  It will bolt up fine, except the bolt heads inside the

bell housing will not bottom out on the bell housing like they do on the other

four bolts without dowels.  So, you'll notice it pretty quick if you look at

stuff like that when putting it together.  If you don't look, it's pretty easy

to miss it as the bolts will bottom out on the dowels and you'll assume all is


I also change the drive and driven gears for the speedometer to function

correctly, but, some people say they don't and the speedo works fine with just

changing the driven gear.  I still can't figure that one out.  If you change

those, might as well change the pump.  I'm not a big fan of the metal pump

gears though, so if the fiber ones look good I stick with those.

Good luck with your project.



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Wedge List / Re: gearboxes
« Last post by Dave on April 28, 2017, 03:10:18 PM »
Another difference may be the drive gear for the speedometer.  The difference between the 3.08 and 3.91 gears may have required a different gear on the transmission shaft.  But this is just a guess.



Dave Massey
Wedge List / Re: gearboxes
« Last post by Mark Elbers on April 28, 2017, 03:06:01 PM »
Jim,  I mounted  my tr7 gear box behind the rv8 without any trouble.  At the

time the differences were as follows:


Clutch assembly

Throw out bearing carrier

Throw out bearing arm pivot pin

Remote shifter assembly

Speedometer gear

I was told that later boxes received strength upgrades to synchros and gears

and that these upgrades could be applied to 7's and 8's interchangeably.  I've

also seen talk on the inter webs that once a gear set is broken in behind a

tr7 engine it might not last long behind the rv8.   I question that last bit

of wisdom.  but there you are.

Mark Elbers

Wedge List / Re: gearboxes
« Last post by Tim Greenlee on April 28, 2017, 12:34:18 PM »
I think the suffix on an LT77 gearbox is more important than the Prefix.

Rebuild kits are identified by  using the suffix.

Wedge List / Re: gearboxes
« Last post by on April 28, 2017, 12:02:45 PM »
TR8 gearboxes have a CN prefix, TR7 gearboxes have a CL

prefix. Why the difference? Wayne, Brent and I are guessing it might be

because the bellhousing is considered part of the whole thing but we really

don't know so I thought I'd ask youB wise list dudes.


 The CN gearbox has a different speedo drive gear than the CL gearbox.  Not sure if the shifter remote is considered part of the gearbox unit but, if it is, that would be another difference as the CN one is shorter than the CL one.  Other than that, I don't think there are any other differences...

I have a CL gearbox in my TR8 - the original trans started making bad noises so I changed it out (intending to rebuild it SOMEDAY) before it self destructed - and, other than swapping the bell housing, clutch pivot, lever and bearing, and shifter remote, it was bolt in.  I did have to compensate for the different speedo drive gear by changing the speedo pinion gear to get a reasonably accurate speedometer reading.  

Wedge List / Re: gearboxes
« Last post by Kelvin Dodd on April 28, 2017, 11:42:21 AM »
The shifter remote control is a different length as is the throw out pivot.

Other than that you can interchange them.

Sent by smoke and mirrors.

Wedge List / gearboxes
« Last post by tencate on April 28, 2017, 11:36:02 AM »
The 5 speed LT77 gearbox used in the TR7 and TR8 appears to be

similar/identical (haven't compared two side by side exactly, not SURE all the

mounting holes and what not are exactly the same) BUT I do know the gear

ratios are the same between early TR7 and TR8 boxes. But that's all I know.

So, the question is, TR8 gearboxes have a CN prefix, TR7 gearboxes have a CL

prefix. Why the difference? Wayne, Brent and I are guessing it might be

because the bellhousing is considered part of the whole thing but we really

don't know so I thought I'd ask youB wise list dudes.

I ask because we know

whichB TR7 CL gearboxes started comingB with the different 5th gear but I'm

not sure which CN gearbox numbers had them. Somehow I recall that the early

1981 TR8s did not have the different 5th, only later ones.

Either way, my

plan is to pull the old CN tranny from the TR8, take off the support stuff

(e.g., bellhousing, etc) and move it to Tim's CL gearbox and pop it all back

in place so I can rebuild the original gearbox at my leisure. And maybe

rebuild the original with the lower 5th gear if that's even possible. Or not.

But this whole CL CN thing has me "concerned". Learn something new every day

it seems.

NO, haven't searched through the list archives yet, maybe the

answer is in there so apologies if this has been answered a million times





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