Hr special 186S 4speed 3.36 LSD Australian Motor road test sept 1967
on the last 3 pages which are zoom able.

http://members.tripod.co...s_holdens/hr/hrmag2.html

Edited by user Friday, 11 March 2016 5:05:11 PM(UTC)  | Reason: link not working

Holy shit !! The Opel's first gear ratio is 3.428. With a final drive of 3.55, it would be pretty good off the line, for a car of the HR's weight.

Dr Terry

Edited by user Friday, 11 March 2016 8:56:40 PM(UTC)  | Reason: Spelling

Ok so i have had a look around the hr i found some more numders in the engine bay
The are on the firewall first one is on a tag it is m150697 the second one is stamped into body where the gear box go through the firewll is hr74034m.and i had the body code wrong it reads
Hr225mr-71075m
Any help would be appreciated .iam starting to think dr terry is right about the nasco gear cheers

Thanks dr terry i rolled her out of the shed today duster her off. is there any where i could look on the body for more information?

...did the chassis numbers start at 1001 for HD/HR ?....I'm pretty sure the body numbers were started from number 1

You've just about got all the numbers, with the exception of possibly the most important one of all. What is the engine number of the 186S ? It is stamped into the block on the machined pad next to the driver's side engine mount, just forward of the distributor.

Also, if you look closely on the little tin shield on the front of the diff you might see the rear axle ratio stamped there. You will need to clean it thoroughly & use a torch to read it. It's just rearward of the rear uni flange. It should read 3.36 or 3.55.

Other than that you can look for the various parts that are unique to the 186S, Opel & disc brake combination. The extra gauges in the dash, along with its unique red ammeter wiring. The rubber floor shift boot for the Opel gearstick. The correct booster & brake pipes for the disc brake set-up. The correct WW Bendix-Stromberg twin barrel carby with its unique linkage. The carb should be stamped 23-201 & made in the US, not Australia as the later ones were.

Are there any signs of it having an LSD or power steering ?

Dr Terry

Edited by user Saturday, 12 March 2016 7:11:02 PM(UTC)  | Reason: Additional info

...it appears these HR's were a fairly Hi-Po jigger .. was there a road wheel/tyre option to cater for this higher performance which may have been "shown" in the option codes numbers ?

Edited by user Saturday, 12 March 2016 7:36:02 PM(UTC)  | Reason: Not specified

Not sure how deep you want to get in to the date coding numbers side of things but they are on a lot of parts on these cars with them.
If you have a look here
http://s872.photobucket....oding?sort=3&page=1
There is a collection of date coding related pictures that show just where some of these date codes are.
Not all the pictures are HR related but it will give you a idea as to what to look for.
Cheers Paul.

...I've just read an interesting snippet on another forum from 2008 where Dr Terry explains of a "very rare" HD/HR heavy duty wheel option that He'd personally never seen any of....

...This type of option may help to de-mystify some of the rarer option codes seen on these obscurely specced models....??

...as interesting as this car has become, could a breakdown of the code 1782 go something like this....

....1 = 186
....7 = 4 speed
....8 = ?
....2 = 186S options

...In a perfect world this would leave us with only the 8 number to figure out ! Also could the numeral 2 be the package of items that make up a 186S car....Instruments, mechanicals, badges, ?? etc. or is it just the 186S engine that is given the code ?

Edited by user Monday, 14 March 2016 7:59:50 AM(UTC)  | Reason: Not specified