• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

TR2/3/3A Tr6 a type overdruve in my tr3 too long

Got_All_4

Luke Skywalker
Country flag
Offline
Just installed the engine and tranny in my TR3A and as you can see in the pics it too long. What's the solution? My 3 only had a 4 speed in it.
 

Attachments

  • tmount.jpg
    tmount.jpg
    73.1 KB · Views: 52

charleyf

Jedi Knight
Bronze
Country flag
Offline
You need to modify the lower plate under the transmission mount, by drilling two holes rear of the existing two. Apparently this is needed because the front flange on the transmission is thicker on the later transmissions. You will also need to use longer bolts for mounting it to the engine. You may also need to cut down the raised portion of the mounting bracket as it may well hit the bottom side of the transmission.
Charley
 

TR3driver

Great Pumpkin - R.I.P
Offline
Nope, it's an A-type. J-type mounting is totally different and the body of the OD passes through where the mount would be on an A-type.

Charleyf nailed it, but the extra length is due to the synchro on 1st gear. Even the TR4 box with the thin flange was roughly 3/8" longer than the 3 synchro box.
 
OP
Got_All_4

Got_All_4

Luke Skywalker
Country flag
Offline
So what do I do with the angled part of the plate? I thinking it's there to give it some extra strength. As you can see in the pic if I just drill the 2 holes and bolt it down then the rubber mount will hit the angled piece.
 

GTP1960

Jedi Knight
Offline
So what do I do with the angled part of the plate? I thinking it's there to give it some extra strength. As you can see in the pic if I just drill the 2 holes and bolt it down then the rubber mount will hit the angled piece.

I elongated the holes & flipped it over ( ground down the shorter flange a little & used a ridge cover for more protection, but that was probably unnecessary )
image.jpeg
 

CJD

Yoda
Country flag
Offline
I slotted the upper holes in the mount, so I did not have to butcher the plate. That slides the mount forward so it all fits. Mounts are cheaper than the plate right now.
 

TR3driver

Great Pumpkin - R.I.P
Offline
On my mount, there wasn't room to modify the upper plate. So I drilled the crossmember, and bent the back edge down (big Crescent wrench plus a BFH IIRC) so it would clear the mount.
I've lost track of long it's been that way, but the crossmember looked fine even after the accident that ruined the body (and some pretty aggressive driving including an autoX trophy).
 
Last edited:

charleyf

Jedi Knight
Bronze
Country flag
Offline
I cut the rear flange enough for the transmission to clear. That is very sturdy piece of metal. If something is going to fail it will be the welds at the frame. Which on one car I restored did have cracked welds on those mounts. I do believe that the car had been raced in a previous life. I also found weld cracks in the front suspension.
Charley
 
OP
Got_All_4

Got_All_4

Luke Skywalker
Country flag
Offline
Hear is what I did. Kind of a combination of all the ideas. I was concerned of loosing strength in the bracket by cutting it. Now with drilling 2 holes so close together that there could be the possibility of getting some stress cracking between the holes. So to fix the original holes and strengthen the bracket I took an old transmission mount that the rubber was missing, wacked the ends off then made a long cut about an inch wide down the length. Basically made a piece of angle iron. Clamped it to the bottom side of the bracket and made sure I covered the holes then plug welded the holes shut. Also ran a bead on each side of the angle iron to the bottom of the bracket. Still had to cut some of the back edge off and bend it down too a lot. Even more then in the pic.
 

Attachments

  • tbracket.jpg
    tbracket.jpg
    64.1 KB · Views: 26
Similar threads
Thread starter Title Forum Replies Date
M TR6 TR4 A Type into a tr6 Triumph 1
GTP1960 TR2/3/3A tr6 Type A OD tranny service Triumph 10
D TR6 76 TR6 J Type Overdrive Triumph 7
T TR6 TR6 J-type OD stuck engaged Triumph 9
K TR6 TR6 J Type Overdrive...Link to Schematic? Triumph 3
T TR6 J-type OD to replace A-type in a TR6 Triumph 7
R_Lyle TR6 TR6 J-Type overdive hard engaging Triumph 9
R_Lyle TR6 J-Type or A-Type Overdrive for 1972 TR6 Triumph 18
T TR6 What year TR6 cut over to Type-J O/D? Triumph 3
I TR6 What type of oil for TR6 rear shocks? Triumph 2
Steve1970 TR6 TR6, how to free the j-type OD switch from cowl? Triumph 4
kodanja TR6 TR6 Ford type 9 conversion Triumph 0
BierRunner TR6 TR6 Gas Pedal Triumph 2
nichola TR6 Another TR6 back on the road Triumph 1
TR6Canuck TR6 Wire spoke rims to fit Michelin Red Line Tires on TR6 Triumph 12
E TR6 74 TR6 - ā€œ A Post Sealā€ Triumph 0
J Wanted TR6 seat vinyl Triumph Classifieds 1
E TR6 Temp Gauge - 74 TR6 Triumph 11
K TR6 tr6 not starting Triumph 8
E TR6 74 TR6 Renegade Dash Wire Triumph 7
BwanaJoe TR6 TR6 radiators Triumph 4
E TR6 ā€˜74 TR6 Starter & Trans Cover Triumph 13
M TR6 Fuse box wiring mystery Triumph 9
M TR6 Windshield Trim TR6 Triumph 14
J TR6 72 TR6 starter problem Triumph 10
nichola TR6 Procar Pro-90 Seats in the TR6 Triumph 0
E TR6 TR6 top dash trim paint Triumph 2
S TR6 Should I Buy This "73 Triumph TR6" Triumph 3
J TR6 1975 TR6 Alternator Advance/Retard spring(s) Triumph 1
F For Sale Wheel Trim Rings Triumph TR6, $95.00 Triumph Classifieds 0
P TR6 TR6 Frame Stiffener Triumph 4
Geo Hahn TR6 TR6 Oil Line Thread Size Triumph 1
C TR4/4A Advice for grafting TR6 frame front to TR4A frame rear Triumph 14
C TR6 Latest TR6 updates and pics Triumph 10
P TR6 TR6 Horn Relay Problems Triumph 8
tr6nitjulius General TR TR6 Triumph 0
Sherlock Triumph TR6 (rather modified) Spotted 2
D TRIUMPH TR6 BODY SHELL Triumph Classifieds 0
M For sale rear wings Tr6 Triumph Classifieds 3
tr6nitjulius TR6 Ongoing Love Affair with 1 TR6 Triumph 8
J TR6 73 TR6 Temp Gauge Wiring Question Triumph 6
M Have a pair of tr6 rear wings Triumph Classifieds 0
Ripper01 Sold- TR6 Differential drive Triumph Classifieds 1
Ripper01 For Sale- TR6 Wiring Harness Triumph Classifieds 0
B TR6 TR6 1976 Clutch Choice Question Triumph 3
Gliderman8 TR6 Spark plugs for TR6 Triumph 7
tr6nitjulius TR6 TR6 meeting my Demands & Giving Back more! Triumph 2
tr6nitjulius TR6 TR6 Triumph 0
M Wanted TR6 Rear Bumper impact Brackets Triumph Classifieds 0
C TR6 TR6 TURN SIGNAL PROBLEM Triumph 13

Similar threads

Top