• The Roadster Factory Recovery Fund - Friends, as you may have heard, The Roadster Factory, a respected British Car Parts business in PA, suffered a total loss in a fire on Christmas Day. Read about it, discuss or ask questions >> HERE. The Triumph Register of America is sponsoring a fund raiser to help TRF get back on their feet. If you can help, vist >> their GoFundMe page.
  • Hey there Guest!
    If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.
    **Upgrade Now**
    (PS: Subscribers don't see this UGLY banner)
Tips
Tips

TR5/TR250 Transmission # ?

Share this page

tinman58

tinman58

Jedi Knight
Silver
Country flag
Offline
Last Saturday we went to the British car show ia the Blackhawk Muesum. Great show ( we took first place in our division) .
The transmission was pretty sad. I did not go thru it when I restored the 250. (Big mistake).
One block from home first gear went CRUNCH! I was able to get home in second gear.
All the other gears work fine. When I drained the trans fluid small pieces of what looks like a needle bearing came out. Not good. So I pulled out the trans and took it to our vintage trans shop. He did not seem to optimistic. The number on the trans is CT 65195. I know that the engine is from a 72 TR6. I cant find the prefix CT anywhere. I want to make sure i get the right parts for the rebuild. Any body know where i can find more information on the trans numbers?
 
OP
tinman58

tinman58

Jedi Knight
Silver
Country flag
Offline
Thank You Charley
The TR4 transmission with a TR6 engine, Could the extra 2 cylinders ruin a trans? I guess i should find a good TR6 transmission.
I am noe think about the HVDA conversion , I have that on my TR3
 
PeterK

PeterK

Yoda
Offline
Dan, I have a good 250 gearbox but I'm in Maine. Non OD but AFAIK in good working order. I purchased from a guy that was putting a big V8 in his 250.
 
Geo Hahn

Geo Hahn

Yoda
Country flag
Offline
I do not think using a 4 cylinder TR gearbox in a 6-cylinder TR would be enough to cause any issues.

I don't know what a gearbox rebuild costs but I would certainly consider a rebuilt unit with OD from John Esposito (Quantumechanics) among the options.
 
Kleykamp

Kleykamp

Jedi Trainee
Offline
Years ago, before Al Gore invented the internet, I had to locate a trans for a 69 TR6. All I could come up with was out of a TR3 which was sold to me to be "the same transmission" ( which we all know is not accurate ). We were, however, able to use parts from the TR3 transmission to rebuild the TR6 transmission. So, they are very similar. Point being, I don't think the TR4 trans would be too weak for the TR250 6 cyl.
 
charleyf

charleyf

Luke Skywalker
Country flag
Offline
I believe the only differences between the internals of the two trannys is some of the bearings. Of course those would be to take any extra wear caused by the bigger engine. I suspect that most authorities believe there is little difference in their ability to take the load. Actually even the Stag transmission is very similar to the TR6 tranny and that would be for a V8.
Charley
 
TomMull

TomMull

Darth Vader
Silver
Country flag
Offline
+1. There were several upgrades from the early TR3 transmissions to The TR250 and TR6. It would be nice to have those upgrades, I suppose, but not necessary. Assuming yours is non overdrive, I don't think the latter transmissions are that scarce.
I would simply rebuild the one you have and if your transmission expert can't do it from the CT number, perhaps get another expert. Of course you could also him go go through one like PeterK's instead.
As for a OD rebuilt from Esposito, good idea but I don't think your core, without OD, would be of much value. I'm sure there are rebuilts available on the West Coast too.
Tom
 
Geo Hahn

Geo Hahn

Yoda
Country flag
Offline
charleyf said:
I believe the only differences between the internals of the two trannys is some of the bearings. Of course those would be to take any extra wear caused by the bigger engine...
Click to expand...

50% more cylinders but the displacement went from 2138 to 2498 - a 16.8% increase. Not a huge bump, all things considered.
 
OP
tinman58

tinman58

Jedi Knight
Silver
Country flag
Offline
I do have the a-type overdrive. Would it be worth to get a TR6 trans and rebuild it? Or should i just rebuild and up grade the TR4 trans? I don't want to be without the 250 for a month or more.
 
M

malbaby

Jedi Warrior
Country flag
Offline
Have you considered buying a 1970's Triumph 6 cyl sedan OD gearbox and having it checked out before installing.....We had lots of sedans here in Australia, do not know about the USA....or converting to a 5 speed gearbox eg.toyota.[ I can put you in touch with a friend of mine in Toronto that has done the conversion on his 250 ].
 
TomMull

TomMull

Darth Vader
Silver
Country flag
Offline
tinman58 said:
I do have the a-type overdrive. Would it be worth to get a TR6 trans and rebuild it? Or should i just rebuild and up grade the TR4 trans? I don't want to be without the 250 for a month or more.
Click to expand...

I'd call around for an exchange unit, by far the fastest way. I think your OD TR4 unit will be an acceptable core so check on that. Here's from google for comparison, I have no knowledge of this company, perhaps you can find something on the West Coast: https://www.wishboneclassics.com/content/rebuilt-tr250-tr6-transmission-w-j-type-od

 
glemon

glemon

Yoda
Country flag
Offline
Even if you farm the work out, here is a great article about rebuilding the TR trannies, including information on the differences, which as noted are not that great, but as I recall upgrading to newer spec is a little more complicated than just swapping out older bearings for new style.

https://vintagetriumphregister.org/maintenance/ scroll down
 
OP
tinman58

tinman58

Jedi Knight
Silver
Country flag
Offline
I just found a 1971 engine and 4 speed trans for $650. What is the work involved to install the a type overdrive on the 4 speed trans? Approx 23,000 miles on both.
 
glemon

glemon

Yoda
Country flag
Offline
I tried to do it, and the tranny worked for a while, but then wouldn't shift into 2nd gear. I work on most anything except trannies and diffs. If you pull the tranny yourself it doesn't cost as much for a professional rebuild.
 
Last edited:
C

carpecursusII

Jedi Trainee
Country flag
Offline
The correct trans for your 250 should be CD XXXX. it would be between 200-300 higher than your commission number. As far as repair is concerned, it's doable. I've built 7-8 gearboxes and 4 of them have been ODs. There isn't much that requires advanced knowledge or special tools. If you were closer I'd gladly lend a hand. PM me if you want to chat about it.
 
OP
tinman58

tinman58

Jedi Knight
Silver
Country flag
Offline
This is what I found in the bottom of the drain pan.
IMG_4339.jpg
It looks like what is left of needle bearings. Also there was a LOT of metal shavings.
The transmission guy still hasn't gotten to the tear down yet.
 
D

DavidApp

Yoda
Gold
Country flag
Offline
Are they needles or teeth. It almost looks like flats on them when I zoom in on the photo. Whatever they are it is not good.

David
 
OP
tinman58

tinman58

Jedi Knight
Silver
Country flag
Offline
needles
 
Similar threads
Thread starter Title Forum Replies Date
Jim_Gruber Correct Transmission Oil for Datsun 210 5-speed Spridgets 1
Got_All_4 General Tech TR6 Transmission Troubles Pops Out of 3rd gear Triumph 2
mctriumph SOLD!! Tr7/ Tr8 transmission Triumph Classifieds 0
C TR6 Transmission Number Meaning Triumph 5
R 100-4 Transmission Austin Healey 1
S TR2/3/3A Rebuilding a tr3 transmission and second gear, Triumph 57
S TR2/3/3A turn a tr3 non-full syncro transmission into a full syncro Triumph 3
J TR4/4A TR4A automatic transmission conversion Triumph 6
Popeye TR4/4A Transmission noise - intermittent Triumph 22
D XK150 Transmission Input Shaft Jaguar 1
A TR2 Transmission overhaul Restoration & Tools 0
E General MG Transmission Fluid Level MG 2
B Transmission Gear Lockouts Austin Healey 8
K Putting a Getrag 5 speed OD transmission in a Jaguar Mkll ? Jaguar 4
AUSMHLY Transmission Noise Austin Healey 11
KVH General TR Transmission Problem Triumph 3
T Looking for "BillMs rear transmission mount" Spridgets 2
T For Sale Excellent Original 1968 TR250 Frame with Engine & Transmission Triumph Classifieds 6
D TR2/3/3A Torque for bolts back of transmission ? Pl Triumph 0
bighealeysource Side-Shift Transmission Austin Healey 13
D transmission conversion Other British Cars 1
PAUL161 T-Series Original transmission sold MG 2
KVH TR4/4A Assembling Transmission to Engine--Vice/Versa Triumph 4
BritBite Transmission Repair Austin Healey 8
AUSMHLY Transmission Bearing, Sealed vs. Non-Sealed Austin Healey 6
AUSMHLY BJ8 Transmission Gasket Austin Healey 0
AUSMHLY R & R BJ8 Transmission Bearings Procedure Austin Healey 1
AUSMHLY BJ8 transmission 3rd gear chipping Austin Healey 0
AUSMHLY BJ8 transmission mainshaft bearing force needed to install/remove Austin Healey 1
AUSMHLY BJ8 Transmission Oil Capacity Austin Healey 1
TR6Canuck For Sale 72 TR6 clutch and transmission Triumph Classifieds 4
N Ribcase transmission won’t engage 3rd or 4th gear Spridgets 19
N Sprite "Ribcase" Transmission Austin Healey 3
AUSMHLY Transmission Sliding Hub Plungers Austin Healey 9
AUSMHLY BJ8 Transmission Front/Rear Bearing Shim Austin Healey 2
AUSMHLY Denis Welch Pre-Load Transmission Washers Austin Healey 0
AUSMHLY BJ8 Transmission just rebuilt now has metal filings Austin Healey 10
S MGB Transmission cross member re-install MG 14
AUSMHLY Flushing the Transmission/Overdrive Austin Healey 7
AUSMHLY BJ8 Transmission Gasket Austin Healey 0
WHT BJ8 Transmission Installation Austin Healey 0
T Weight of BJ7 Transmission/Overdrive Austin Healey 10
T How to ship transmission from Canada to Rivergate in Tennesee? Spridgets 8
AUSMHLY BJ8 Transmission Gasket Sealer Austin Healey 18
A TR6 Installing differential and transmission Triumph 10
PAUL161 T-Series 5 Speed Transmission MG 85
PAUL161 T-Series Replacing Transmission MG 3
WHT Tremec T-5 Five-Speed Transmission Austin Healey 39
R TR2/3/3A Transmission Service TR-2 Triumph 58
Spock TR6 Transmission Plug Triumph 4

Similar threads

Top