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Old 03-07-2011, 08:21 PM   #1
ryanfay
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Default laycock p/j?

Ok, Ive seen type P and type J, but what is a type p/j?

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Old 03-07-2011, 09:56 PM   #2
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Oh yes, it exists. Id post a pick if I could upload from my camera phone.
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Old 03-07-2011, 11:38 PM   #3
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Do you mean PBJ? LOL

But seriously, post a picture because i have not heard of a P/J.
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Old 03-08-2011, 12:43 AM   #4
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It was on a m46 in a 1988 740t sedan with a b234.
I tried to get a picture uploaded, but my phone sucks.
The picture shows a type p/j. Whatever that is.
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Old 03-08-2011, 02:37 AM   #5
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Originally Posted by fcpgroton View Post
Do you mean PBJ? LOL
You called Johnathan? Paul Brian Jones here.

Never heard of a P/J type. I could see it being confused with how some articles mention the two together as an abridge version of P or J type overdrive and lump them together as two overdrives found on the M46, thus the P/J overdrive on the M46.

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Old 03-08-2011, 02:48 AM   #6
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wiki say
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The first production vehicle to feature the Laycock system was the 1948 Standard Vanguard Saloon. The first unit to be created was the A-type overdrive, this was fitted to many sports cars during the 1950s. Several famous marques used A-type overdrives, including Jaguar, Aston Martin, Ferrari, Austin-Healey, Jensen, Bristol, AC and Armstrong Siddeley. Later the A-type overdrive was to be fitted to the entire range of TR cars.

In 1959, the Laycock Engineering Company introduced the D-type overdrive, which was fitted to a variety of motor cars including Volvo 120 and 1800s, Sunbeam Alpines and Rapiers, Triumph Spitfires, and also early 3-synchro MGBs.

From 1967 the LH-type overdrive was introduced, and this featured in a variety of models, including 4-synchro MGBs, the Ford Zephyr, early Reliant Scimitars, TVRs, and Gilberns.

The J-type overdrive was introduced in the early 1970s, and was adapted to fit Volvo, Triumph, Vauxhall/Opel, American Motors and Chrysler motorcars, and Ford Transit vans.

The P-type overdrive marked the last updates and included both a Gear Vendors U.S. version and a Volvo version. The Volvo version kept the same package size as the J-type but with the updated 18 element freewheel and stronger splines through the planet carrier. The Gear Vendors U.S. version uses a larger 1.375 outer diameter output shaft for higher capacity and a longer rear case.

Over a period of 40 years, Laycock Engineering manufactured over three and a half million overdrive Units, and over one million of these were fitted to Volvo motorcars.

In 2008 the U.S. company Gear Vendors, Inc. of El Cajon, California purchased all the overdrive assets of GKN to continue production of the U.S. version and all spares for J and P types worldwide.
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Old 03-08-2011, 04:18 AM   #7
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Its def a p/j.
Im going to swoop it this weekend as I still need a m46.
I'll post pics so you guys believe me.
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Old 03-08-2011, 03:46 PM   #8
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AFIK the only Volvo's that got the latest upgrades versions of the laycock overdrive were 740T's and 780's where the M46 was found with an alumnimum casing and the P 'II' type OD. These are much stronger OD units, and should be savoured.
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Old 03-08-2011, 03:48 PM   #9
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Quote:
Originally Posted by ryanfay View Post
It was on a m46 in a 1988 740t sedan with a b234.
I tried to get a picture uploaded, but my phone sucks.
The picture shows a type p/j. Whatever that is.
Def NOT a stock set-up. 740 GLE came with B234, not 740T's
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Old 03-08-2011, 06:29 PM   #10
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B-234 only got an Automagic here in the States.

OP.... Does your OD have a speedo-drive hole? I've never seen a P-Type OD with a speedo-drive.
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Old 03-08-2011, 08:42 PM   #11
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Quote:
Originally Posted by JohnLane View Post
B-234 only got an Automagic here in the States.

OP.... Does your OD have a speedo-drive hole? I've never seen a P-Type OD with a speedo-drive.
this is not true, i've seen a few b234 cars with factory m46.

either way, as long as your don't boost in o/d it doesn't matter which type you have, 3rd gear will always shatter first.
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Old 03-08-2011, 09:54 PM   #12
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I put 740t but its NA sorry fellas. Hella baked
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Old 03-10-2011, 01:01 PM   #13
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Here is one:


They came in late 1990 and 1991 740Ts and B234 equipped cars. If found in an earlier 700 series, it is a replacement transmission from Volvo. Laycock incorporated the best feature of the P and J type. At one time I know what the changes were, but I've forgotten.
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Old 03-10-2011, 01:22 PM   #14
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Quote:
Originally Posted by 500dollar744ti View Post
this is not true, i've seen a few b234 cars with factory m46.

either way, as long as your don't boost in o/d it doesn't matter which type you have, 3rd gear will always shatter first.
hm. well, whatever GV did to modify them, the new GV units hold like 1200hp or something rediculous like that (they're for diesel trucks). only problem I ever saw out of one was reverse not working due to the clutch or whatever was in it being shot.
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Old 03-10-2011, 01:27 PM   #15
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Quote:
Originally Posted by JohnLane View Post
B-234 only got an Automagic here in the States.

OP.... Does your OD have a speedo-drive hole? I've never seen a P-Type OD with a speedo-drive.
I might disagree about the B234 equipped 740s coming with only an AW72 in the states. The M46 with P/J type my son has came from a very late production B234 equipped 1990 740. The car the transmission came from appeared to be quite stock, there was no sign of any conversion work. If it was a conversion, it had been done cleanly.
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Old 03-10-2011, 01:52 PM   #16
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Yes I pulled a P/J out of a 16v M46 car at the north portland upullit to get the flywheel some other gancouver then bought the tranny. The P type overdrive fits the bigger shaft of the turbo cars bigger shafted m46-86 and newer aluminum case. The J type overdrive has a smaller shaft in the tranny and smaller shaft hole and was used in NA volvos and early turbo k-junk 240's....

I'm not sure about the size of the shaft or hole on the P/J type overdrive.

My factory 1990 745 with factory m46 had a P type only overdrive on it from the factory.
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Old 03-10-2011, 01:52 PM   #17
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Quote:
Originally Posted by linuxman51 View Post
hm. well, whatever GV did to modify them, the new GV units hold like 1200hp or something rediculous like that (they're for diesel trucks). only problem I ever saw out of one was reverse not working due to the clutch or whatever was in it being shot.
Back in 1997, I had Gear Vendors build me an overdrive since I thought mine was slipping. When I talked to them, I asked after I got it, what it can hold. The response was 1000lb/ft.

Needless to say, it was kinda a waste due to the M46 just not strong enough to handle much over 250lb/ft rear wheel.

So, eventually, I will sell my Gear vendor overdrive.

PJ
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Old 03-10-2011, 02:13 PM   #18
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P type OD unit was also for 120/1800 IIRCC
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Old 03-10-2011, 02:18 PM   #19
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Quote:
Originally Posted by smokeyfan1000 View Post
P type OD unit was also for 120/1800 IIRCC
Article above contradicts that.
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In 1959, the Laycock Engineering Company introduced the D-type overdrive, which was fitted to a variety of motor cars including Volvo 120 and 1800s, Sunbeam Alpines and Rapiers, Triumph Spitfires, and also early 3-synchro MGBs.
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Old 03-10-2011, 02:49 PM   #20
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IIRC the 1800 E/ES was fitted with the M410 and J Type OD. P type wasn't on M46 until ~80-81

Back to the P/J OD.
I always thought it was called M46 P OD 'Type II' , or second generation, which paralleled the M47 Type II also introduced in 1990. AFIK, the later M46 had improvements in the case (alum) and gearbox bearings from straight roller to tapered roller bearings as did the M47, as well as the bigger OD shaft, clutch and output bearings.
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Old 03-10-2011, 11:02 PM   #21
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I dont think its a type p II. I have one in the car now. Thats after I burned out the original.
One major difference is my p/j has a flexdiscless driveshaft. Which is ok by me.
Other than that, I cant tell.
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