• 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

TR4/4A 67 TR4a irs to live axle

Rut

Obi Wan
Silver
Country flag
Offline
Back in my ill spent youth I had a 67 TR4a non irs car that I enjoyed as much as any car I’ve ever owned. I currently have 4 irs cars including Jim’s Desert TR and would like to convert one of them (not Desert TR) to a live axle. How big of a pita would this be and what parts would I need, stock or otherwise? I may even do this to the car I plan on ‘resto moding’. I also have a couple of extra restored frames, a TR4a and a 6 with additional strengthening brackets. Thoughts?
Thanks, Rut
 

Popeye

Jedi Knight
Country flag
Offline
It seems like all you have to do is whack off the differential mount and install the live axle bits... "seems" is a big word, I realize.

Looking at the photos of the two configurations: https://stevemckelvie.files.wordpress.com/2011/08/scan0263.jpg and https://stevemckelvie.files.wordpress.com/2011/08/scan0259.jpg, it looks like the spring mounting uses the same holes in the frame.

Perhaps the workshop manual has more detailed information, where the frame measurements are tabled, on the differences.
 
OP
Rut

Rut

Obi Wan
Silver
Country flag
Offline
Mike,
Thanks for the info and once I get moved I’ll study this more closely. My manual and parts are all packed up. I wonder if it would be easier to use a TR4 frame and rear suspension?
Thanks, Rut
 

Popeye

Jedi Knight
Country flag
Offline
I don't think the TR4 frame will fit that 4A? In any case it would require modification, as both of the 4A frames (IRS, solid axle) have the narrow "t-shirt" section.
 

Popeye

Jedi Knight
Country flag
Offline
I don't think the TR4 frame will fit that 4A? In any case it would require modification, as both of the 4A frames (IRS, solid axle) have the narrow "t-shirt" section.
 

PeterK

Yoda
Offline
have a solid 4A and have been building a period correct fast road for years, many more to go! Bodywork is minor but takes me a major time. Wow, was it really nearly 14 years ago? dcp_0618.jpg
 

cjimj

Member
Country flag
Offline
I went the other direction to replace the rotting frame on my 4A IRS. As I recall, you'll need an axle, springs, spring blocks, u-bolts, front spring brackets, rear spring brackets, brakes, brake lines, and shock links.

Jim
 
OP
Rut

Rut

Obi Wan
Silver
Country flag
Offline
Rut,
TR4 frame and 4a frame not the same. I looked at doing a live axle TR6. I think all you need diff and springs.
Marv
Marv,
Thanks for the info and next question, do you have the parts I need? We got the CO on our house yesterday including the shop, so the march of the LBCs will begin today. Picture of shop and the boss checking things out.
Rut
 

Attachments

  • E2EB0065-7A25-4923-A02E-7551EAD4E822.jpg
    E2EB0065-7A25-4923-A02E-7551EAD4E822.jpg
    49.2 KB · Views: 41
  • A68EF8F6-3E1B-45BB-9FD0-B40F6503CAF3.jpg
    A68EF8F6-3E1B-45BB-9FD0-B40F6503CAF3.jpg
    48.7 KB · Views: 41

Alfred E. Neuman

Jedi Trainee
Offline
Just thinking out loud here, but I think you could get live axle reliability and handling with upgrading your IRS. Revington suspension kit with uprated springs, HD shocks, and sway bar, plus their trailing arm brackets that let you adjust both camber and toe via eccentrics.
Get some upgraded axle shafts and hubs from Richard Good and you'd have a car that wouldn't have the TR IRS squat in the back and be super planted in the curves while eliminating nearly all of the drawbacks of the TA geometry.
 
OP
Rut

Rut

Obi Wan
Silver
Country flag
Offline
Just thinking out loud here, but I think you could get live axle reliability and handling with upgrading your IRS. Revington suspension kit with uprated springs, HD shocks, and sway bar, plus their trailing arm brackets that let you adjust both camber and toe via eccentrics.
Get some upgraded axle shafts and hubs from Richard Good and you'd have a car that wouldn't have the TR IRS squat in the back and be super planted in the curves while eliminating nearly all of the drawbacks of the TA geometry.

Ive given this some thought along with the coil over conversion and while it’s very nice, it’s really expensive. That said, this car might possibly end up being a resto mod with a Ford rear end to handle M3 or Toyota/Lexus power. The easiest route sounds like swapping in live axle components from a 4a, both from labor and wallet.
Thanks, Rut
 

Marvin Gruber

Yoda
Silver
Country flag
Offline
Rut,
think I have some of the parts. I had a wreaked live axle, Dad used some of the parts years ago. Have to check, would be after I get back from CSB.
Marv
 
OP
Rut

Rut

Obi Wan
Silver
Country flag
Offline
Marv,
Thanks, have fun and I’ll check back in a month.
Rut
 

malbaby

Jedi Warrior
Country flag
Offline
Rut...Is it you or "the boss" that has such great taste in house design. Here in Australia, most houses are very plain in comparison.
Are those ceiling beams in the main living room structural?
Like to see pics of the kitchen.
 

Foura

Jedi Hopeful
Gold
Country flag
Offline
Nice to have an open fire in the garage. :eagerness:
 
OP
Rut

Rut

Obi Wan
Silver
Country flag
Offline
Mal,
It’s mostly the boss who decides, but the coffered ceiling is my idea. My grandmothers house had a very similar ceiling and I loved it growing up. I get to do the nuts and bolts, Jo gets to decide what it should look like and I really like her taste. Our nephew is a builder and our son is a home remodler and after we broke ground last October they decided to build the business together. We found out in December and sold our son our house about 6 weeks ago and they moved to town. It has been the easiest process and not the nightmare you sometimes hear about. We are blessed beyond words and to have our son and his family close by is icing on the cake! I’ll take some pictures of the kitchen and post them later...Jos a good cook and she designed it.
Rut
 
OP
Rut

Rut

Obi Wan
Silver
Country flag
Offline
Well, I’m completely off topic now and I’ve attached a couple of kitchen pictures, but I forgot to take pictures of the LBCs in their new home! I imagine the next week of moving will be pretty hectic since everything is so scattered.
Rut
 

Attachments

  • 95932C57-98FD-46B4-97ED-0C2AE741F717.jpg
    95932C57-98FD-46B4-97ED-0C2AE741F717.jpg
    45.3 KB · Views: 29
  • 2454E1B0-7A2A-449C-8349-410D5FAE77DF.jpg
    2454E1B0-7A2A-449C-8349-410D5FAE77DF.jpg
    47.4 KB · Views: 33
OP
Rut

Rut

Obi Wan
Silver
Country flag
Offline
Mal,
Shes very proud of it and I’m very happy it turned out the way she wanted. Thanks for the compliment!
Rut
 
Similar threads
Thread starter Title Forum Replies Date
Scotsman TR4/4A TR4a Live axle vs IRS Triumph 13
fpstude TR4/4A Replacing Rear Flexible Brake Hoses on TR4A w/ IRS Triumph 11
S TR4/4A Build Date Triumph TR4A IRS Triumph 3
M TR4/4A Reducing Chassis Flex on TR4A IRS Triumph 2
jfarris For Sale 1967 TR4A IRS $19,000 Birmingham AL Triumph Classifieds 3
Brinkerhoff TR4/4A Straightening a TR4A IRS chassis Triumph 15
J Wanted Tr4a irs frame Triumph Classifieds 1
L For Sale late tr4a IRS project Triumph Classifieds 0
J TR4/4A TR4A IRS Grille Question Triumph 4
O TR4/4A Will these tires/wheels work on my 1966 TR4a, IRS? Triumph 19
G TR4/4A tr4a irs left rear wheel Triumph 14
C TR4/4A TRIUMPH TR4A iRS For Sale - NUT & BOLT RESTORATION--[CONCOURS CONDITION] Triumph 2
C TR4/4A 1967 TR4A IRS motor mounts Triumph 7
Zimmycobra TR4/4A TR4A IRS Differential Mounts Triumph 8
Zimmycobra TR4/4A any tricks to change rear brake hose - especially on passenger side [TR4A IRS] Triumph 9
richie TR4/4A Wheel fitment on TR4a solid axle vs IRS Triumph 6
rovernut TR4/4A TR4A IRS VIN differences Triumph 9
Gerard TR4/4A TR4A IRS rear suspension rebuild Triumph 10
T TR4/4A 65 triumph tr4a-irs tires Triumph 7
J TR4/4A TR4A IRS Trunk Triumph 3
J TR4/4A TR4A IRS Exhaust Triumph 5
T TR6 TR4a IRS vs TR6 handling Triumph 20
KVH TR4/4A TR4A IRS Front and Rear Differential Bridge Pins Triumph 6
J TR4/4A TR4A IRS Clamps, Belt and Suspenders? Triumph 4
J TR4/4A TR4A IRS Exhaust Triumph 11
britlover TR6 TR4A IRS body on a TR6 Frame?? Differences? Triumph 10
J TR4/4A TR4A IRS Jack Stands Triumph 6
J TR4/4A Shock Absorbers TR4A IRS Triumph 3
R TR4/4A 66' TR4a irs, steering nut size Triumph 13
R TR4/4A Tr4a irs, name plate question Triumph 13
J TR4/4A 67 TR4A IRS Hood Bumpers-Cones or Flat? Triumph 8
gubba TR4/4A My new 1967 TR4A IRS Triumph 17
R TR4/4A tr4a irs clunking rear end on fast acceleration Triumph 7
J TR4/4A TR4A IRS Home Triumph 5
J TR4/4A 67 TR4A IRS picked up today! Triumph 23
R TR4/4A Disc wheel studs front and rear TR4a irs Triumph 4
T TR4/4A Broken disc wheel stud on TR4A IRS hub. Triumph 3
RJS TR4/4A TR4A IRS Diff Capacity Triumph 3
T TR4/4A Fired the 67 TR4a IRS engine today Triumph 5
T TR4/4A Which TR4a is better - IRS or solid axle? Triumph 30
Darrell_Walker TR4/4A TR4A IRS-SC?!?!?! Triumph 48
KVH TR4/4A TR4A IRS Differential and Axles Removed Triumph 11
KVH TR4/4A TR4A IRS Issues and Smashed Thumb Question Triumph 24
KVH TR4/4A TR4A IRS Axle Shafts Triumph 19
KVH TR4/4A TR4A IRS Rear Spring Bridge Triumph 6
KVH TR4/4A TR4A IRS Rear Suspension Knock Triumph 3
T TR6 Anyone use TR6 rear springs in their TR4a IRS? Triumph 8
T TR4/4A TR4a IRS differential mount issues Triumph 11
T TR4/4A TR4A IRS trailing arm bushing question Triumph 15
bcliff TR4/4A Triumph TR4A IRS FS. Need help with this one.PICS! Triumph 6

Similar threads

Top